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/RoomNotifs.js

@@ -16,7 +16,7 @@ limitations under the License.
 
 import MatrixClientPeg from './MatrixClientPeg';
 import PushProcessor from 'matrix-js-sdk/lib/pushprocessor';
-import q from 'q';
+import Promise from 'bluebird';
 
 export const ALL_MESSAGES_LOUD = 'all_messages_loud';
 export const ALL_MESSAGES = 'all_messages';