Initial functionality

- Adds two convenience functions for vault validation and cleanup that uses a manager object to track data throughout the process
- Provides a general structure for the project
- Achieves 100% test coverage on the structure

There is much left to do to complete this, but the basic structure and public interface should now be in place.
See https://github.com/rackerlabs/deuce-valere/pull/5#discussion_r20720200