Update beta release date

Author: brson

install.html

@@ -6,7 +6,7 @@
     <div class="row install">
       <div class="col-md-offset-1 col-md-3 side-header">
         <h2>1.0.0-beta.2</h2>
-        <h3>April 3, 2015</h3>
+        <h3>April 17, 2015</h3>
         <p>
 	  A feature-complete preview of the 1.0.0 release.
         </p>