Initial version sent to Ghana

Lowered current, added voltage cutoff at 5.7 V.  If charging mode is
entered, it will return to lighting mode no matter what.  Completing
charge has blinking at 1.5 seconds.  During charge, every 8 seconds.
Small fix to make off to dim transition not have any really bright
flashes.

No temperature compensation.  No indication for battery not needing any
more charging (ex: battery plugged in at 95% capacity).  Need to add
power-reducing sleep mode.