Adding ability to filter files by regex during analyze step.
filter-files probably reads better as a list comprehension.
Adding clj-jgit and beginning to walk the revision list to build filename -> last modified time. Starts #3
Implementing name-to-file (maps filename -> git modification time, given a commit list). Continues #3
Modifying name-to-files to convert time to unix timestamp. Continues #3
Rebasing master.