Added several visualisations for different msg types (based on nav2djs), added zooming and panning. Fixed rotation (zero angle facing east), this will probably break nav2djs a bit
fixed goal rotation
first commit of navigation example
register mouse handlers
removed need for position at endGoal()
move navigation to new repo
rotated navigation arrow, such that it points east at 0 rotation
moved Grid to models
Merge pull request #21 from vliedel/devel

added panning, zooming, extra models, fixed rotations