Support for lightweight admin client

It became pretty clear that there's a good case for a lightweight admin client that I and eventually Global DS can use to facilitate this app and project.  Here are the initial additions:
 - support for an administrator password, with higher privileges than a translator
    - tracked at both access code and auth token level
 - a languages endpoint that can be used to create a new language. creating a new language also creates drafts for every package for one stop shopping
 - meta endpoint lets administrators see all things (both live and draft)