Fix for issue #462

Modified uploadCompose action to send media ids of attached
media when sending a request. Modified create method in MediaController
to check if when posting a video, there are no other media attached
to the status by looking at the media ids sent from the uploadCompose
action.

app/assets/javascripts/components/actions/compose.jsx

@@ -119,7 +119,10 @@ export function uploadCompose(files) {
 
     let data = new FormData();
     data.append('file', files[0]);
-
+    data.append('media_ids', getState().getIn(
+      ['compose', 'media_attachments']
+    ).map(item => item.get('id')));
+    
     api(getState).post('/api/v1/media', data, {
       onUploadProgress: function (e) {
         dispatch(uploadComposeProgress(e.loaded, e.total));