replace imports of q with bluebird

update `package.json`

```
find src test -name '*.js' |
   xargs perl -i -pe 'if (/require\(.[qQ].\)/) { $_ = "import Promise from '\''bluebird'\'';\n"; }'

find src test -name '*.js' |
   xargs perl -i -pe 'if (/import [qQ]/) { $_ = "import Promise from '\''bluebird'\'';\n"; }'
```

src/utils/MultiInviter.js

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import {getAddressType, inviteToRoom} from '../Invite';
-import q from 'q';
+import Promise from 'bluebird';
 
 /**
  * Invites multiple addresses to a room, handling rate limiting from the server