Add method to verify if Google Play services are available.

..plus simple maintenance of the code, and adding the methods
onActivityResult(int requestCode, int resultCode, Intent data) and
addFragment (Fragment fragment).
Code Refactoring + Attempts to use Location Client for receiveing
periodic updates from Location Services.
Code Refactor - Decoupling HomeActivity with the MapFragment by adding a
new Interface - Implement the periodic updates from Google Services
according to Google Developer successfully