added basic pointerlock support, fixed up docs for fullscreen
added basic pointerlock support, fixed up docs for fullscreen

gopalindians/melonJS,srbala/melonJS,gopalindians/melonJS,melonjs/melonJS,rlugojr/melonJS,MarkoIvanetic/melonJS,TukekeSoft/melonJS,srbala/melonJS,TukekeSoft/melonJS,MarkoIvanetic/melonJS,srbala/melonJS,rlugojr/melonJS,gopalindians/melonJS,TukekeSoft/melonJS,melonjs/melonJS,rlugojr/melonJS