Merge branch '1.4'

src/Composer/Repository/Vcs/BitbucketDriver.php

@@ -312,7 +312,7 @@ abstract class BitbucketDriver extends VcsDriver
                 http_build_query(
                     array(
                         'pagelen' => 100,
-                        'fields' => 'values.name,values.target.hash,next',
+                        'fields' => 'values.name,values.target.hash,values.heads,next',
                         'sort' => '-target.date',
                     ),
                     null,