fixed the `isIdentity()` and `toString()` functions
fixed the `isIdentity()` and `toString()` functions

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