Generalized ToolTester to be able to handle analysis at all atom levels instead of only at the sentence level. The code for the atom-to-atom metric remains but needs to be refactored to work properly. It was always too slow to calculate the atom-to-atom metric though, so the fact that it is not functioning is not a loss. Read the note at the top of tool_test.py if you don't know what the atom-to-atom metric is.
Merge branch 'master' of https://github.com/NoahCarnahan/plagcomps