Add `NSLocation*UsageDescription` help
Merge branch 'master' of github.com:csexton/proximitykit-documentation

* 'master' of github.com:csexton/proximitykit-documentation:
  Fix typo.
  Add Proximity Kit Android SDK javadoc link.
  Remove unnecessary paragraph tags.
  Fix broken links
  Re-write the geofence getting started guide.
  Update overview with Android SDK changes.