Update DeviceLocationOnMapActivity.java

LocationService has been deprecated since 10.2.2.  User LocationDisplayManager instead.
https://developers.arcgis.com/android/api-reference/reference/com/esri/android/map/LocationService.html
Update DeviceLocationOnMapActivity.java
Update README.md
Merge pull request #1 from delatitude/master

updated for new version! thx