Fixed help text typos, corrected values of ON and OFF for Night Light in GE switches, added value for Always Off.


![ge night light](https://cloud.githubusercontent.com/assets/1943283/5155714/70852b2c-725a-11e4-812b-07de2f328034.png)
Fixed labels of values in light parameter in ge/relay.xml and ge/dimmer.xml to properly reflect Yes and No (they were swapped).
Added new value for night light parameter in ge/relay.xml and ge/dimmer.xml for always off.