Allow callers to set value of notifyAuthFailure

Since a caller might want AndroidAuthenticator to show a notification
instead of delivering an error, allow it to be specified.

Change-Id: I9232668f4e8e83b46da2c2fb1c678246c735f200
adding isCached function to ImageLoader

Change-Id: I771a608910a7b2b1dc1fe1d30395a7bb0738592e
Merge "adding isCached function to ImageLoader"
Merge "Allow callers to set value of notifyAuthFailure"
Fixed image retrieval
Merge branch 'mainline/master'