Add rest server

Creates REST endpoints to support governance log manipulation as outlined in [Issue 1](https://github.com/courage-labs/freefrog/issues/1). Still missing user CRUD, anchor circle CRUD, and user -> role assignment.
Could we also have an assertion that the header contains the URL pointed to the newly created entity (http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.2)? No idea how to make liberator do that.