Added overhead map
Merge remote-tracking branch 'remotes/upstream/master'
Remove FollowPositionScript (not used eventually)
Fixed layering (no need to copy the entire map)
Changed map following to explicit plane (solves a problem when cart turns over, the cart position disappars)
Change clear flags so map appears without background.
Merge pull request #92 from thegsm/OverheadMapAdditions

Overhead map additions

(try not to change the order of the layers in the future if possible, but everything works  = ] awesome minimap.)