Updater quicksetting tile
Improve updatecheckservice for quicksetting tile updates
ExodusUpdater: add a notifier activity

primary use: to remind users they forgot to install a gapps because
some people need a bit of a smack. Ported from my original work in
vanirupdater.

Change-Id: I18605c770cbe770f8134719b3134c575effc9100