Check if the Activity is finishing before showDialog()

Check if the Activity is going through its finishing phase before
displaying the Dialog, because Showing dialog once the activity
is no longer in context will cause BadTokenException.

Change-Id: I58940e694f61cd79536abe2df60a0b745a7b806f
Enabled/Mapped App Ops to Settings
Added in HDPI/MDPI pngs for App Ops
Added DU Changelog back in

Change-Id: Ib3af1809a9ba056daef34dc5779768ad9c4f7571
Added About app back in!!
Added in DU Stats
Move share DU up