Imported overlord solution

Joe/Sophia,
I spent this morning re-doing my level_up fork and branches. I believe it is correct now. Each task now has its own branch containing nothing other than changes pertinent to the task itself.

I'm resubmitting a code-review pull-request for overlord.

Zamir
This action syntax is really weird in Sinatra. I would very much expect to see methods defined using `post '/foo'` instead. I could invoke `/overlords/session_bomb` right now, which is problematic.