Fix Entity\render

* Type in variable and wrong indentation for graphic\render
* Also call super! from update
Fix issue with LP.point2

* Also make camera a new point (though it may need to actually be equal
  to the table that point2 uses.)
* Add a clear (table) function
Add updateLists to Scene

* This commit actually make adding Entities to a Scene work. Lots of
  fixes here.
* Prefix a few more functions with __ that are supposed to be private.
Update the one example with the code from README.md

* This is now a working example roughly equivilant to the first HaxePunk
  tutorial.