add checkstyle plugin and config file
add new blank line rules to checkstyle settings
Merge branch 'develop' into issue/670-refresh-code-style
new script to check introduced style errors
Stats: Refs #874. Retains the selection under Visitors and Views tab when rotated.

The selection wasn't being saved and persisted when the fragment was destroyed and re-created.
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into develop
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into develop
Stats: Refs #874. Using setRetainInstance(true) retains the selection under Visitors and Views tab, when rotated.
add stacktraces to AppLog, fix #1132
use gradle to edit AndroidManifest.xmt to hide crashlytics apikey
use the crashlytics way to 'hide' the apikey
new crashlytics utils
init crashlytics
replace mixpanel calls to logexception with crashlytics
remove unused mixpanel ids to track exceptions
auto generate crashlytics.properties from local.properties
Merge branch 'develop' into feature/crashlytics-integration
init crashlytics only if isDebug=true
Merge branch 'develop' into feature/crashlytics-integration
use crashlytics to report OOM errors