closes #550 - adds own canvas to calculate ratio
closes #550 - adds own canvas to calculate ratio

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