[#379] screencanvas (cocoonJS) support improvement
[#379] screencanvas (cocoonJS) support improvement

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