Remove unnecessary nesting of hashes in an array for verb irregularities when parsing CSVs to JSON. This means changing the verb loading code too (also simplifying it).
Fix inconsistency in verbs CSV which resulted in some errants forward slashes in the JSON (and translations).
Improvements to integration tests (more thorough checking JSON output for verb lists, etc.)
Add some unit tests for the Verb class. (I improved the class while I was at it, too.)