Merge pull request #22 from GeoffreyMetais/feature_androidWear

Check for Pebble connection before activating it.
Wear full screen activity: retrieve latest values when starting, so the elapsed time is set.
Notification logo.
Fixed duration sometimes being incorrect in the notification.
- Use AndroidWearCrashReport
- Fixed ACRA proguard conf
- Use generic AboutActivity from jraf-android-util
- Upgraded to latest gradle plugin