Remove favorites

This branch incorporates the work in branch restore-add-favorite-persistence. (https://github.com/adhocteam/gi-bill-comparison-tool/tree/restore-add-favorite-persistence)  It adds the ability to remove favorites. 

Please note:

1) We need to run through this code before demo to confirm it works for you.  It works for me.  Please call me (mjmiller) when you want to do so. I'll explain all changes.  

2) There are parts I'd like to refactor prior to production to remove duplication.