Fix issue #12. Widget updates now done in async task.
Bumped version to 3.1.3.
Attempt to fix a NPE when selecting menu items.

This is a nasty issue that still needs works. Apparently, sometimes
you may trigger a menu option with the Home fragment set to <null> ...
which should, in general, not be possible because you are already using
the menu on the Home fragment.
Updates in history