added a `toString()` function to me.Matrix2d
added a `toString()` function to me.Matrix2d

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