Use new AltBeacon version of ProximityKit lib.
clean up files committed to git and update .gitignore
convert to new notifiers
Use proximitykit-android 0.1.0.beta2

- Update API calls with changes in beta2
- Include Geofence support using Google Play services
- Remove custom resources path in the gradle to use the default
  location; simplifying the setup for the project
- Bump the minimum SDK per requirements via the new library
Merge pull request #1 from RadiusNetworks/migrate-to-altbeacon

Use new AltBeacon version of ProximityKit lib.