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/createRoom.js

@@ -21,7 +21,7 @@ import { _t } from './languageHandler';
 import dis from "./dispatcher";
 import * as Rooms from "./Rooms";
 
-import q from 'q';
+import Promise from 'bluebird';
 
 /**
  * Create a new room, and switch to it.