Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/worklist/hifi
Added acceleration reading, gravity baseline, and line displays to invensense
Removed old serial code for Maple ADC
Merge remote-tracking branch 'upstream/master'
Added head lean to broadcast data packets, lean now being set from invensense accelerometers.
Merge remote-tracking branch 'upstream/master'
Merge pull request #263 from PhilipRosedale/master

Removed old maple serial code (we are now using Invensense), added acceleration and gravity