updated android studio configuration
removed ACRA configuration from private properties as it's baked into the build.gradle file now.
Updated the PNG to include highlights to things you must set.
check for isScanAlwaysAvailable()
register for WifiManager.WIFI_STATE_CHANGED_ACTION
Merge pull request #1207 from crankycoder/features/1205-doc-updates

1205 - updated build documentation
Merge pull request #1218 from cascheberg/fix

@cascheberg WifiScanner fix state change, and mode where scan on with wifi off