Create IC2_FM_V1

 * Modified routines for scanning UP or DOWN through the FM band (NC pushbuttons)
 * Modified routine to test for signal strength of received station (RSSI)
 * Modified routines to support bass boost and MONO signal (bit shifts)
 * RSSI, read it too soon after setting a station and you get a small value
 * so it's better to wait a bit (50ms) and try it. minSignalStrength will
 * skip locking on a station with a weak signal (you could set the MONO bit) to get
 * better reception on these stations.
* added EEPROM routines to save station and volume (if not pot attached)

![grove_fm_test](https://cloud.githubusercontent.com/assets/8953419/4437269/a7ee2b98-4791-11e4-8eea-cf3153858c6a.png)