Add admin area

The current prototype does not allow us to add new features.  Please change that!   A simple admin screen where we can add term and definition should work great!  

Then we can stop relying on the [DatabaseLoader](https://github.com/treehouse-projects/java-debugging-flashy/blob/master/src/main/java/com/teamtreehouse/flashy/bootstrap/DatabaseLoader.java) finally!
