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"; }'
```

package.json

@@ -54,6 +54,7 @@
   "dependencies": {
     "babel-polyfill": "^6.5.0",
     "babel-runtime": "^6.11.6",
+    "bluebird": "^3.5.0",
     "browser-request": "^0.3.3",
     "classnames": "^2.1.2",
     "draft-js": "^0.8.1",
@@ -69,7 +70,6 @@
     "matrix-react-sdk": "0.9.7",
     "modernizr": "^3.1.0",
     "pako": "^1.0.5",
-    "q": "^1.4.1",
     "react": "^15.4.0",
     "react-dnd": "^2.1.4",
     "react-dnd-html5-backend": "^2.1.2",