[#329] fixed PointerEvent support on IE11
[#329] fixed PointerEvent support on IE11

Simplified some code in the process :)

srbala/melonJS,gopalindians/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,melonjs/melonJS,gopalindians/melonJS,gopalindians/melonJS,MarkoIvanetic/melonJS,rlugojr/melonJS,srbala/melonJS,srbala/melonJS,TukekeSoft/melonJS,melonjs/melonJS,Smoss/Enoru-eco,TukekeSoft/melonJS,rlugojr/melonJS,Smoss/Enoru-eco,MarkoIvanetic/melonJS