Adding hipchat notifications for rogue commits

plus breaking out a bunch of the other rogue bits into separate files.
Cleanup and test coverage for rogue commit hipchat and such
Removing the `.should_notify?` class method for rogue commit notifiers

since they're already short-circuiting based on whatever conditions at
notification time.
Using injected hostname to increase email deliverability
Cleaning up notifier setup

now that the `.should_notify?` method is gone.
Rearranging methods for ease of grokkability
Merge pull request #1 from modcloth-labs/rogue-commit-hipchat-bits

Rogue commit hipchat bits