Add params to collaborators api calls (#623)

* Add params to collaborators api calls

https://developer.github.com/v3/repos/collaborators/#list-collaborators
`GET /repos/:owner/:repo/collaborators`
Params = `affiliation`

https://developer.github.com/v3/repos/collaborators/#add-user-as-a-collaborator
`PUT /repos/:owner/:repo/collaborators/:username`
Params = `permission`

* Add phpdoc to Collaborators api

Author: convenient

lib/Github/Api/Repository/Collaborators.php

@@ -10,21 +10,54 @@
  */
 class Collaborators extends AbstractApi
 {
-    public function all($username, $repository)
+    /**
+     * @link https://developer.github.com/v3/repos/collaborators/#list-collaborators
+     *
+     * @param $username
+     * @param $repository
+     * @param array $params
+     * @return array|string
+     */
+    public function all($username, $repository, array $params = [])
     {
-        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators');
+        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators', $params);
     }
 
+    /**
+     * @link https://developer.github.com/v3/repos/collaborators/#check-if-a-user-is-a-collaborator
+     *
+     * @param $username
+     * @param $repository
+     * @param $collaborator
+     * @return array|string
+     */
     public function check($username, $repository, $collaborator)
     {
         return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators/'.rawurlencode($collaborator));
     }
 
-    public function add($username, $repository, $collaborator)
+    /**
+     * @link https://developer.github.com/v3/repos/collaborators/#add-user-as-a-collaborator
+     *
+     * @param $username
+     * @param $repository
+     * @param $collaborator
+     * @param array $params
+     * @return array|string
+     */
+    public function add($username, $repository, $collaborator, array $params = [])
     {
-        return $this->put('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators/'.rawurlencode($collaborator));
+        return $this->put('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators/'.rawurlencode($collaborator), $params);
     }
 
+    /**
+     * @link https://developer.github.com/v3/repos/collaborators/#remove-user-as-a-collaborator
+     *
+     * @param $username
+     * @param $repository
+     * @param $collaborator
+     * @return array|string
+     */
     public function remove($username, $repository, $collaborator)
     {
         return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/collaborators/'.rawurlencode($collaborator));