Add maven skip options for npm, bower and grunt
Upgrade to latest checker framework

Fix all nullness checker warnings
Upgrade dependency versions
For demo site
Add travis build to run checker validation
Add travis build to run sonar analysis
FIXUP OF SOMETHING
fixup! Add travis build to run sonar analysis
FIXUP OF SOMETHING TRAVIS
fixup! Upgrade to latest checker framework
Sonar inspired cleanup
fixup! fixup! Upgrade to latest checker framework
sonar
fixup travis something
sonar
fixup! Upgrade dependency versions
travis
sonar
SONAR re-work ScheduledRunnable
checker