Test for Levenshtein distance not implemented, but here is a reminder.
First pass at full input-to-output of corrections.
Fixed a couple of glitches allowing the correction to run on other vocabulary sizes.
VariationProposer now uses deletables set.
Commenting out these debug prints for now.
Corrector regression / operation test now passing.
Corrector regression / operation test now passing, and using deletables.
Merge branch 'master' of cs.toronto.edu:conll2013/bare_git
Trigram probability is now a per-word probability, so that insertions and deletions don't bias the beam.
VariationProposer now actually uses the AUX tag.
Split correct and score.  Implemented score.
Added a testing file needed for deletables test.
Made insertables and deletables have to be in the vocabulary.  Fixed some type errors, and changed the type of insertables and deletables to set.
Fixed the fact that insertion and deletions costs were not being counted, and simplified the as yet still simple error_cost_function.
Whitespace-cleanup.
VariationProposer now manipulates capitalization appropriately.
Put more tag-specific restrictions on variations.
trigram model method in corrector passes lowered tokens.  Also added some debug prints.
VariationProposer keeps an LRU cache.  Some debug comment twiddling.