add vibration feature to docs
provide two Handler constructors for convenience
add updated support lib
a few sample tweaks

* add vibrate permission to the sample
* some formatting
README: add minimum version
README: add ant documentation
clarify the consequence of clicking the notification

Explicitly state that that tapping the notification will lock the app.

refs #1789
implement custom notification intents

I took the opportunity to refactor the settings into a separate class.

refs #2424