Alpha 2 released

After roughly two weeks of documentation, it was nice to get back to the code and start hammering out some of the details.  One thing that cropped up when converting the War Battles tutorial was the incredible annoyance of the lack of optional parameters.  So Alpha 2 is here early with that fixed.

Changes:

• Now includes optional parameter variants, so you can now call go.get_position() and not have to specify the id each time.
• Fixed Vector2 OOP api to function more transparently. In particular, math operations with Vector3s are now included.

Installation instructions remain the same as Alpha 1