Remove the kitchen-sink (no, not "Emacs")

After giving it careful thought, it has been decided that "hashie" is
overkill (it defeats the intent of this gem by *not* keeping it simple).

Don't get me wrong, "hashie" is a great gem with an excellent community
behind it, and I will continue to recommend and use it for other
projects of mine, but it's just not right for "Foundry"