replace q method calls with bluebird ones

```
find src test -name '*.js' |
    xargs perl -i -pe 's/q\.(all|defer|reject|delay|try|isFulfilled)\(/Promise.$1(/'
```

src/components/views/settings/ChangePassword.js

@@ -161,7 +161,7 @@ module.exports = React.createClass({
     },
 
     _optionallySetEmail: function() {
-        const deferred = q.defer();
+        const deferred = Promise.defer();
         // Ask for an email otherwise the user has no way to reset their password
         const SetEmailDialog = sdk.getComponent("dialogs.SetEmailDialog");
         Modal.createDialog(SetEmailDialog, {