Notification improvements:

- use NotificationCompat.Builder from the support library and remove the custom progressbar layout; this will give platform users the expected look and feel of a notification with a progress bar
- remove OCNotificationManager (it contained the old layout references, but was unused)
- add new notification icons that follow the Android style guidelines (http://developer.android.com/design/style/iconography.html#notification)

(Sorry for the whitespace changes in two files, I accidentially ran my standard save actions over these files and as such destroyed the previous settings; feel free to re-save them with your standard formatter. Sorry again.)