Firmware Updated on 2014-05-26.

- Implemented automatic behavior on manual mode ($60;) when ask for turn
on a new sector, if it is working, turn off the old one.

- Add SIM900 reset $08;

- Add WDT for a system reset $09;
Firmware Updated - 2014-05-26

Thermal protection implemented.

- Bug on SIM900_checkAlive still exist.