Add a "Update In Progress" notification, and cleanup notifications.

fixes #36, fixes #43
Tweak donation requests
Layout fix in Prefs for German
Add logo shadows
fixup plist editor
pl localization. Fixes #46
Do not try to add geofences if the device doesn't support it, fixes #45
UI Refinements in prefs, adding "enable geofences" switch (refs #44)
Add a "geofences unavailable label" if necessary. refs #44
Hide Geofences in Help if regionMonitoring is unavailable. refs #44
Disable Geofencing with switch in prefs. fixes #44