Show current user in footnotes
Merge pull request #86 from sarahsemark/current-user-in-footnotes

Thumbs-up for usefulness!
Make Postings belong to User, fix #46
Include and set a default sort order
Associate models with users and check for auth

Check for login on all auth-required pages and redirect if the user isn't
signed in. Extra Pundit check for scopes/authorization on virtually every
DB call. So things are getting there re: security.

 * Fix #84
 * Fix #87