Fixed and cleaned code

1. Set pauseLocationUpdatesAutomatically = NO to prevent iOS from stopping backgroud location reporting.
2. Updated config file 
 a. to prevent creation of multiple location entries for UIBackgroundModes on each phongap/cordova build.
 b. update xml structure per other 3.3.0 phonegap config standards.
3. Added instruction in ReadMe to manually update .plist to register for location updates with app in background.