New notification icon according to the design guidelines, notifications are now expandable

- New notification icon according to the [design guidelines](http://developer.android.com/design/style/iconography.html#notification) ([before](https://dl.dropboxusercontent.com/u/7212949/flucso/notif-icon-before.png), [after](https://dl.dropboxusercontent.com/u/7212949/flucso/notif-icon-after.png));
- Notifications are now expandable ([before](https://dl.dropboxusercontent.com/u/7212949/flucso/notif-before.png), [after](https://dl.dropboxusercontent.com/u/7212949/flucso/notif-after.png)).