Renamed the composite unique key because length

Author: Luca Degasperi

src/migrations/2013_07_24_135250_create_oauth_session_token_scopes_table.php

@@ -21,7 +21,7 @@ public function up()
 
             $table->timestamps();
 
-            $table->unique(array('session_access_token_id', 'scope_id'));
+            $table->unique(array('session_access_token_id', 'scope_id'), 'oauth_session_token_scopes_satid_sid_unique');
 
             $table->index('scope_id');