started gate_detector node
added world region message
Implemented world model, which takes in a gate_region, lane_region and
set of obstacles, converts the obstacles to a region mask, and then
computes a drivable region by intersecting all of these regions together
added node to visualize world regions as an image (should probably be
moved to a more generic place)
moved differential driver to corobot repository (for now)
refactored and moved to buzzmobile/processors
Fixed gate detector code
Fixed some more unit and orientation issues
simple yellow line detector
Merge branch 'master' of github.com:gtagency/buzzmobile
attempt to fix units, and instead making things worse.  passing the
batton...
Fixed world model obstacle removal (hopefully)
Cleaned up for loop termination
Changed publishing topic to gate_region
updates to how the merged model is built
Mostly fixed world model
Fixed most seg faults in gate_detector
Merge branch 'master' of https://github.com/gtagency/buzzmobile into car-interface
Updates pot values.