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/components/views/context_menus/RoomTileContextMenu.js

@@ -17,7 +17,7 @@ limitations under the License.
 
 'use strict';
 
-import q from 'q';
+import Promise from 'bluebird';
 import React from 'react';
 import classNames from 'classnames';
 import sdk from 'matrix-react-sdk';