temp
Basic structure of equation tree
Merge branch 'story' into story-update
Checkpoint, unlocked will soon be procedural
Ready for testing
Added compression to persistance so that we can store more data
For the first two levels, generation appears to happen
Merge remote-tracking branch 'origin/story' into story_sm_generates
Organized level 2 nodes

I'm not sure what the best way to do Criteria is.  Also, the updating of
the confidence value is still a black box.
Made first problems easier
Adjustments to some generators,

And removed the extension of EquationGenerator, which is all static
anyway
Moved some things around
Reorganized some more, created stub for updating student model
Added Java logging
Java logging fixes
Cleaned up unused logic and added some tagging method stubs
Speed improvements in A*, but some lost stability
Cleanup from efficiency hacking
Added tagging of SolveActions
Wow, that was a challenge...