Preparing release 0.2
-- Sensors --
moved sensor pin definitions into common.h
added heading correction to sensors. Turns heading reading into compass heading
-- Motion --
moved in definitions to common.h
removed unnecessary maxSpeed variable in motion
fixed potential bug in speedCalc in motion
-- Navigation --
added integral correction to pid controller in nav
Updating readme for release 0.2
Merge branch 'release-0.2' into develop
Merge pull request #14 from jamesdsmith/develop

Updating develop with release 0.2