added nodemon config to Gruntfile
Updated config to include additional paths and a known objectId to drive lookup tests.
Updated world to include helpers for loading known data into mongo before tests, which enables verification of lookup logic.
Added proxyquire as a dependency for intercepting commonjs require calls in the server-side code.
Updated to use configuration from yaml file.
Added the beginnings of a mongoose API stub which is needed to avoid partial mocking of the mongoose library.
Refactored to handled GET requests to /thought/:id, where :id is some valid mongodb objectId.