Show remaining battery life.

Read the 1.1V bandgap reference to figure out VCC and translate to one of 7 icons. I take 100 samples each time but it's still sometimes noisy.

Conflicts:
	Cellphone/Cellphone.ino
	libraries/LedDisplay/LedDisplay.cpp
	libraries/LedDisplay/font5x7.h
Delete LedDisplay files (merged in by mistake).