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/settings/ChangePassword.js

@@ -21,7 +21,7 @@ var MatrixClientPeg = require("../../../MatrixClientPeg");
 var Modal = require("../../../Modal");
 var sdk = require("../../../index");
 
-import q from 'q';
+import Promise from 'bluebird';
 import AccessibleButton from '../elements/AccessibleButton';
 import { _t } from '../../../languageHandler';