silenced some noisey log messages in TileDownloaderDelegate
silenced a lint warning for osmdroid.views.MapView
minor build tweaks to be paranoid during a release build
bumped version to 0.42.0.0
Merge branch 'dev' of https://github.com/mozilla/MozStumbler into less-log-spam

Conflicts:
	android/src/main/java/org/mozilla/osmdroid/tileprovider/modules/TileDownloaderDelegate.java