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/structures/TimelinePanel.js

@@ -17,7 +17,7 @@ limitations under the License.
 
 var React = require('react');
 var ReactDOM = require("react-dom");
-var q = require("q");
+import Promise from 'bluebird';
 
 var Matrix = require("matrix-js-sdk");
 var EventTimeline = Matrix.EventTimeline;