Added a new utility function, math.lineDistance
Merge branch 'master' of https://github.com/ifdm/overgrowth

Conflicts:
	class/entity-manager.lua
	states/game.lua
Added a skeleton rendering for Wall;
Merge branch 'master' of https://github.com/ifdm/overgrowth
Wall component interfacing with Polygon tool;
Merge branch 'master' of https://github.com/ifdm/overgrowth

Conflicts:
	levels