pylygon - 1.3.0rc

I had a minor data loss incident and lost the changelog, but here goes from memory:

* raycast algorithm modified to accommodate translation + rotation

* the 'deg' attribute controlling degrees of rotation is removed

* rotopoints and rotoedges modified to now accept rotation in radians, these two methods are NO LONGER properties

* a rotate and rotate_ip (in place) method added to rotate the polygon.

* and along with all these changes, some internal changes that do not effect usability or API.

* finally, the raycast.py example modified to showcase the new raycast algorithm and simplify the code. left-right arrows to rotate!

OUTSTANDING

* currently no obvious solution to indicate if a rotation would rotate into or out of a collision when using the raycast method.