Add a hash package.
Rename "hash" methods and simplify.
Remove an unnecessary file.
Clean up tests in the hash package.
Merge pull request #16 from ericsnowcurrently/hash

Add a hash package.
Updating to gopkg.in path for bugfix.
Merge pull request #21 from katco-/goyaml-update

Updating to gopkg.in path for bugfix.
Add a file storage abstraction.
Add tests and docstrings.
Add a SetFile method to Metadata.