UI enhancements and additional tests for User.
* Add library favicon
* change container-fluid to container
* Changes to titles on edit pages.
* Some additional tests for user_controller.
* Change user login stub to be a double instead of creating a new user.
* more tests for users_controller
* move edit and delete off on index pages for collections and items
* make titles links on item lists.
Merge pull request #20 from ndlib/ui_and_tests

UI enhancements and additional tests for User.