diff --git a/README.md b/README.md
index e0f6dc36..514e7b6d 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Installation
 ```json
 {
   "require": {
-    "parse/php-sdk" : "1.0.*"
+    "parse/php-sdk" : "1.1.*"
   }
 }
 ```
diff --git a/src/Parse/ParseClient.php b/src/Parse/ParseClient.php
index d38d36f4..d85742a1 100755
--- a/src/Parse/ParseClient.php
+++ b/src/Parse/ParseClient.php
@@ -44,11 +44,16 @@ final class ParseClient
    */
   private static $storage;
 
+  /**
+   * @var - Boolean for enabling revocable sessions.
+   */
+  private static $forceRevocableSession = false;
+
   /**
    * Constant for version string to include with requests.
    * @ignore
    */
-  const VERSION_STRING = 'php1.0.6';
+  const VERSION_STRING = 'php1.1.0';
 
   /**
    * Parse\Client::initialize, must be called before using Parse features.
@@ -56,7 +61,7 @@ final class ParseClient
    * @param string $app_id                Parse Application ID
    * @param string $rest_key              Parse REST API Key
    * @param string $master_key            Parse Master Key
-   * @param string $enableCurlExceptions  Enable or disable Parse curl exceptions
+   * @param boolean $enableCurlExceptions  Enable or disable Parse curl exceptions
    *
    * @return null
    */
@@ -65,6 +70,7 @@ public static function initialize($app_id, $rest_key, $master_key, $enableCurlEx
     ParseUser::registerSubclass();
     ParseRole::registerSubclass();
     ParseInstallation::registerSubclass();
+    ParseSession::registerSubclass();
     self::$applicationId = $app_id;
     self::$restKey = $rest_key;
     self::$masterKey = $master_key;
@@ -341,6 +347,9 @@ public static function _getRequestHeaders($sessionToken, $useMasterKey)
     } else {
       $headers[] = 'X-Parse-REST-API-Key: ' . self::$restKey;
     }
+    if (self::$forceRevocableSession) {
+      $headers[] = 'X-Parse-Revocable-Session: 1';
+    }
     /**
      * Set an empty Expect header to stop the 100-continue behavior for post
      *   data greater than 1024 bytes.
@@ -384,4 +393,17 @@ public static function getLocalPushDateFormat($value)
     $date = date_format($value, $dateFormatString);
     return $date;
   }
+
+  /**
+   * Allows an existing application to start using revocable sessions, without forcing
+   * all requests for the app to use them.  After calling this method, login & signup requests
+   * will be returned a unique and revocable session token.
+   *
+   * @return null
+   */
+  public static function enableRevocableSessions()
+  {
+    self::$forceRevocableSession = true;
+  }
+
 }
diff --git a/src/Parse/ParseObject.php b/src/Parse/ParseObject.php
index 33e20d12..d701eeb9 100755
--- a/src/Parse/ParseObject.php
+++ b/src/Parse/ParseObject.php
@@ -532,7 +532,7 @@ public function _mergeAfterFetchWithSelectedKeys($result, $selectedKeys)
   private function mergeFromServer($data, $completeData = true)
   {
     $this->hasBeenFetched = ($this->hasBeenFetched || $completeData) ? true : false;
-    $this->mergeMagicFields($data);
+    $this->_mergeMagicFields($data);
     foreach ($data as $key => $value) {
       if ($key === '__type' && $value === 'className') {
         continue;
@@ -567,7 +567,7 @@ private function mergeFromServer($data, $completeData = true)
    *
    * @return null
    */
-  private function mergeMagicFields(&$data)
+  public function _mergeMagicFields(&$data)
   {
     if (isset($data['objectId'])) {
       $this->objectId = $data['objectId'];
diff --git a/src/Parse/ParseSession.php b/src/Parse/ParseSession.php
new file mode 100644
index 00000000..2c93f8c2
--- /dev/null
+++ b/src/Parse/ParseSession.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Parse;
+
+use Parse\ParseObject;
+use Parse\ParseUser;
+
+/**
+ * ParseSession - Representation of an expiring user session.
+ *
+ * @package  Parse
+ * @author   Fosco Marotto <fjm@fb.com>
+ */
+class ParseSession extends ParseObject
+{
+
+  public static $parseClassName = "_Session";
+
+  private $_sessionToken = null;
+
+  /**
+   * Returns the session token string.
+   *
+   * @return string
+   */
+  public function getSessionToken()
+  {
+    return $this->_sessionToken;
+  }
+
+  /**
+   * Retrieves the Session object for the currently logged in user.
+   *
+   * @param boolean $useMasterKey If the Master Key should be used to override security.
+   *
+   * @return ParseSession
+   */
+  public static function getCurrentSession($useMasterKey = false)
+  {
+    $token = ParseUser::getCurrentUser()->getSessionToken();
+    $response = ParseClient::_request('GET', '/1/sessions/me', $token, null, $useMasterKey);
+    $session = new ParseSession();
+    $session->_mergeAfterFetch($response);
+    $session->handleSaveResult();
+    return $session;
+  }
+
+
+  /**
+   * Determines whether the current session token is revocable.
+   * This method is useful for migrating an existing app to use
+   * revocable sessions.
+   *
+   * @return boolean
+   */
+  public static function isCurrentSessionRevocable()
+  {
+    $user = ParseUser::getCurrentUser();
+    if ($user) {
+      return self::_isRevocable($user->getSessionToken());
+    }
+  }
+
+  /**
+   * Determines whether a session token is revocable.
+   *
+   * @param string $token The session token to check
+   *
+   * @return boolean
+   */
+  public static function _isRevocable($token)
+  {
+    return strpos($token, "r:") === 0;
+  }
+
+  /**
+   * After a save, perform Session object specific logic.
+   *
+   * @return null
+   */
+  private function handleSaveResult()
+  {
+    if (isset($this->serverData['sessionToken'])) {
+      $this->_sessionToken = $this->serverData['sessionToken'];
+      unset($this->serverData['sessionToken']);
+    }
+    $this->rebuildEstimatedData();
+  }
+
+}
\ No newline at end of file
diff --git a/src/Parse/ParseUser.php b/src/Parse/ParseUser.php
index f357a927..f2f4d72c 100644
--- a/src/Parse/ParseUser.php
+++ b/src/Parse/ParseUser.php
@@ -162,13 +162,20 @@ public static function become($sessionToken)
 
   /**
    * Log out the current user.  This will clear the storage and future calls
-   *   to current will return null
+   *   to current will return null.
+   * This will make a network request to /1/logout to invalidate the session
    *
    * @return null
    */
   public static function logOut()
   {
-    if (ParseUser::getCurrentUser()) {
+    $user = ParseUser::getCurrentUser();
+    if ($user) {
+      try {
+        ParseClient::_request('POST', '/1/logout', $user->getSessionToken());
+      } catch (ParseException $ex) {
+        // If this fails, we're going to ignore it.
+      }
       static::$currentUser = null;
     }
     ParseClient::getStorage()->remove('user');
diff --git a/tests/IncrementTest.php b/tests/IncrementTest.php
index 2e35f8db..5f5650db 100644
--- a/tests/IncrementTest.php
+++ b/tests/IncrementTest.php
@@ -211,7 +211,7 @@ public function testIncrementEmptyFieldAndTypeConflict()
     $obj->save();
     $objAgain->increment('randomkey');
     $this->setExpectedException('Parse\ParseException',
-      "can't increment a field that isn't a number"
+      "invalid type for key"
     );
     $objAgain->save();
   }
diff --git a/tests/ParseCloudTest.php b/tests/ParseCloudTest.php
index c8749acc..04dc573e 100644
--- a/tests/ParseCloudTest.php
+++ b/tests/ParseCloudTest.php
@@ -31,13 +31,6 @@ public function testFunctionsWithGeoPointParamsDoNotThrow()
     ParseCloud::run('unknown_function', $params);
   }
 
-  public function testExplicitFunctionFailure()
-  {
-    $params = array('key1' => 'value1');
-    $this->setExpectedException('Parse\ParseException','bad stuff happened');
-    ParseCloud::run('bar', $params);
-  }
-
   public function testUnknownFunctionFailure()
   {
     $params = array('key1' => 'value1');
@@ -45,49 +38,4 @@ public function testUnknownFunctionFailure()
     ParseCloud::run('unknown_function', $params);
   }
 
-  public function testFunctions()
-  {
-    $params = array(
-      'key1' => 'value1',
-      'key2' => array(1,2,3)
-    );
-    $response = ParseCloud::run('foo', $params);
-    $obj = $response['object'];
-    $this->assertTrue($obj instanceof ParseObject);
-    $this->assertEquals('Foo', $obj->className);
-    $this->assertEquals(2, $obj->get('x'));
-    $relation = $obj->get('relation');
-    $this->assertTrue($relation instanceof ParseObject);
-    $this->assertEquals('Bar', $relation->className);
-    $this->assertEquals(3, $relation->get('x'));
-    $obj = $response['array'][0];
-    $this->assertTrue($obj instanceof ParseObject);
-    $this->assertEquals('Bar', $obj->className);
-    $this->assertEquals(2, $obj->get('x'));
-
-    $response = ParseCloud::run('foo', array('key1' => 'value1'));
-    $this->assertEquals(2, $response['a']);
-
-    try {
-      $response = ParseCloud::run('bar', array('key1' => 'value1'));
-      $this->fail('Should have thrown an exception.');
-    } catch(Parse\ParseException $ex) {
-      // A parse exception should occur.
-    }
-
-    $response = ParseCloud::run('bar', array('key2' => 'value1'));
-    $this->assertEquals('Foo', $response);
-
-    $obj = ParseObject::create('SomeClass');
-    $obj->set('name', 'Zanzibar');
-    $obj->save();
-
-    $params = array('key2' => 'value1', 'key1' => $obj);
-    try {
-      $response = ParseCloud::run('foo', $params);
-      $this->fail('Should have thrown an exception.');
-    } catch (\Exception $ex) {
-      // An exception should occur.
-    }
-  }
 }
\ No newline at end of file
diff --git a/tests/ParseObjectTest.php b/tests/ParseObjectTest.php
index 89921ad6..2262d5a0 100644
--- a/tests/ParseObjectTest.php
+++ b/tests/ParseObjectTest.php
@@ -271,7 +271,7 @@ public function testCanSetBoolean()
   public function testInvalidClassName()
   {
     $obj = ParseObject::create('Foo^bar');
-    $this->setExpectedException('Parse\ParseException', 'Bad Request');
+    $this->setExpectedException('Parse\ParseException', 'bad characters in classname');
     $obj->save();
   }
 
diff --git a/tests/ParseSessionTest.php b/tests/ParseSessionTest.php
new file mode 100644
index 00000000..42db1846
--- /dev/null
+++ b/tests/ParseSessionTest.php
@@ -0,0 +1,61 @@
+<?php
+
+use Parse\ParseClient;
+use Parse\ParseObject;
+use Parse\ParseQuery;
+use Parse\ParseUser;
+use Parse\ParseSession;
+
+require_once 'ParseTestHelper.php';
+
+class ParseSessionTest extends PHPUnit_Framework_TestCase
+{
+
+  public static function setUpBeforeClass()
+  {
+    ParseTestHelper::setUp();
+    ParseTestHelper::clearClass(ParseUser::$parseClassName);
+    ParseTestHelper::clearClass(ParseSession::$parseClassName);
+  }
+
+  public function tearDown()
+  {
+    ParseTestHelper::tearDown();
+    ParseUser::logOut();
+    ParseTestHelper::clearClass(ParseUser::$parseClassName);
+    ParseTestHelper::clearClass(ParseSession::$parseClassName);
+  }
+
+  public static function tearDownAfterClass()
+  {
+    ParseUser::_unregisterSubclass();
+    ParseSession::_unregisterSubclass();
+  }
+
+  public function testRevocableSession()
+  {
+    ParseClient::enableRevocableSessions();
+    $user = new ParseUser();
+    $user->setUsername("username");
+    $user->setPassword("password");
+    $user->signUp();
+    $session = ParseSession::getCurrentSession();
+    $this->assertEquals($user->getSessionToken(), $session->getSessionToken());
+    $this->assertTrue($session->isCurrentSessionRevocable());
+
+    ParseUser::logOut();
+
+    ParseUser::logIn("username", "password");
+    $session = ParseSession::getCurrentSession();
+    $this->assertEquals(ParseUser::getCurrentUser()->getSessionToken(), $session->getSessionToken());
+    $this->assertTrue($session->isCurrentSessionRevocable());
+
+    $sessionToken = $session->getSessionToken();
+
+    ParseUser::logOut();
+
+    $this->setExpectedException('Parse\ParseException', 'invalid session token');
+    ParseUser::become($sessionToken);
+  }
+
+}
\ No newline at end of file