Issue #9: Remove unused walk up code in util module.
Issue #9: Remove old git repo detection code that isn't being used any longer from util module.
Issue #9: Refactor isoDateComparator to have a better name for what it actually does.
Issue #9: Refactor branch tuple(s) into objects for better readability and comprehension.
Issue #9: Encapsulate date parsing from string and to relative dates rather than retrieving them from git.
Issue #9: Remove import statement accidentally left in after timeutil module was removed.
Issue #9: Remove usage of timeutil module.
Issue #9: Correct misspelled variable name.
Issue #9: Add a test for marking branch health.
Issue #9: Refactor test using a git repo out into a separate base class for extensibility.