[LinphoneThread] added refreshRegisters
[SimlarService] triggers refreshRegisters on network change

 * This is a part of the solution for issues #7 and #13.
[SimlarService] moved acquire/release WakeLock and WifiLock to own funtions
[SimlarService] AlarmManager starts refreshRegister every 10 minutes

 * This is a part of the solution for issues #7 and #13.
Merge pull request #27 from simlar/keepAwake-pullrequest3

Keep awake pullrequest3