minor doc fixes
moved light testing code to a new program, tests/light_test
Merge pull request #34 from wbattestilli/master

nightlight mode only saves brightness when turned off (mimimize eeprom writes)
Merge branch 'master' of github.com:dhiltonp/hexbright
light_test: fixed typo
library: commenting out ACCELEROMETER works
experiments/power_draw: added info about the accelerometer
hb-examples/stroboscope: makes sure the light stays on (needed after early July update of core library)
improved documentation on power draw
doc fix: down_light link corrected
documentation: overview moved above video/text setup instructions
documentation: up_n_down and tactical mentioned in the overview
documentation: added a link to hexbright.com