Update android to 4.4.2_r2, compat lib to 19.0.1
Fix crash with a null share PendingIntent on 4.0.x

The `include_widgetbuttons.xml` had to be slightly rewritten, since hiding one of the buttons (share)
caused a misalignement due to the first positioned item being `GONE`.
Also applied some nazi-stylish code refactoring in `UpdaterService.java` (what's with one line curly braces?).

Should be ready for an immediate merge into master for a new release.

Fixes #112
Merge branch 'hotfix/112-npe-pending-intent'