replace q method calls with bluebird ones

```
find src test -name '*.js' |
    xargs perl -i -pe 's/q\.(all|defer|reject|delay|try|isFulfilled)\(/Promise.$1(/'
```

src/components/views/context_menus/RoomTileContextMenu.js

@@ -61,7 +61,7 @@ module.exports = React.createClass({
         const roomId = this.props.room.roomId;
         var cli = MatrixClientPeg.get();
         if (!cli.isGuest()) {
-            q.delay(500).then(function() {
+            Promise.delay(500).then(function() {
                 if (tagNameOff !== null && tagNameOff !== undefined) {
                     cli.deleteRoomTag(roomId, tagNameOff).finally(function() {
                         // Close the context menu
@@ -212,7 +212,7 @@ module.exports = React.createClass({
         RoomNotifs.setRoomNotifsState(this.props.room.roomId, newState).done(() => {
             // delay slightly so that the user can see their state change
             // before closing the menu
-            return q.delay(500).then(() => {
+            return Promise.delay(500).then(() => {
                 if (this._unmounted) return;
                 // Close the context menu
                 if (this.props.onFinished) {