Started revising summary code
Fixed summary bug
Some unit test tweaks
More summary improvements; bug fix
Minor tweaks
Fixed bug
Improved unit tests
Fixed summary bugs; expanded unit tests
Improved unit tests
Added TODO item
Misc. tweaks
Some unit test refactoring; fixed some random test breakage
Refactored test directory
More unit testing
Fixed a bug; more unit testing
Misc. tweaks
Adjusted todo.txt
Misc. tweaks
Some system spec cleanup
Cleanup, especially in spec_helper