Allow collision coordinates to be negative

Basically you put a collision circle centred on the character unless possibly you create  sprite with a lot of white space to the far left and top.

Strange, I am on 3.1 and I still have this issue.



EDIT : indeed, as explained here [http://community.stencyl.com/index.php/topic,20657.msg120409.html#msg120409] is works also when you  upload a larger image than your actual actor's