basic android stuff, code is a royal mess
Trying a few things to fix the code
orthographic projection
Renaming/commenting a few things out
now redners a cube properly
merge
Trying out simple draggable icon activity.
Adding new classes/interfaces to generalize expression trees
Adding a simple view and some minor indentation fixes
Starting unit test project
removing generated files
Merge branch 'master' of bitbucket.org:mtao/challengenfactorial

Conflicts:
	src/com/mtao/challengenfactorial/ChallengeRenderer.java
	src/com/mtao/challengenfactorial/NFactorialGLSurfaceView.java
	src/com/mtao/challengenfactorial/NumberBlock.java
Adding more tests
Checking that div op throws exception when appropriate
Adding a class that builds trees from a list of values.
added several game states, bounding boxes for positions, and the game works though very rudimentary. added errors to binary operator stuff
merge
fixed operator selection bug + print state information + detect division error