removed unnecessary forward declarations
gamemap now loads tilesets
it now renders...
added Renderer class
removed unnecessary #include
scenes now will render maps
added scenemanager class
fleshed out scenemanager a bit
included iostream in engine.h
fixed linux build
removed outdated tracker url from readme
Merge branch 'master' of github.com:vheuken/Purity2D
renamed libs to ext/libs
fixed CMakeLists.txt
fixed CMakeLists.txt
refactored GameMap and Scene
added PhysicsSystem class
added PhysicsSystem to engine class
made physicssystem::update() public
added physics update to game loop