Ignore doc folder
Update Engine documentation
Make engine speeds protected
Make Engine a Singleton
Add Engine#willBeMoving; closes #2
Refactor Engine#move
Reword documentation
* start converting to back sensor
* merge conflicts
* wall following should work
Merge branch 'master' into engine_circle
* tune parameters
* merge conflicts
* merge conflicts
* fix compiler errors
* wall following works
* try sweeping
* move with sweeping
* wall following with sweeping works
* pause sweeping
* remove printlns