Merge branch 'release/1.1.1' into develop
add maintainer notes
remove IOException from Session API; wrap instead

- report getCause() for RainwaveException when it exists
check http response code for authentication reponse

fix issue #26
do less validation of API key
also clear the current session when clearing preferences
add a little hint about a forbidden key
calculate a drift between server time and client time
apply server time drift to countdowns

fix issue #25
Merge branch 'feature/drift' into develop
apply time drift to vote deadlines
use known_event_id when possible

This allows server to rush a schedule update if desynchronization occurs.

fix issue #24
version bump
Merge branch 'release/1.1.2beta1'