added a new function to automatically set a property to a given value for all existing childs
added a new function to automatically set a property to a given value for all existing childs

rlugojr/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,MarkoIvanetic/melonJS,srbala/melonJS,TukekeSoft/melonJS,gopalindians/melonJS,srbala/melonJS,melonjs/melonJS,gopalindians/melonJS,melonjs/melonJS,srbala/melonJS,rlugojr/melonJS,Smoss/Enoru-eco,MarkoIvanetic/melonJS,Smoss/Enoru-eco,gopalindians/melonJS