Added ability to add goals

Work on #9, added a route (goals.store) used to add goals. Haven't added any validation yet, anything can be added. Scary stuff!
Adding a 'deletable' column to goals database

This column will eventually be used to track if it is possible to delete a goal
(For example, a personal goal can be deleted, but a goal required by a manager should not)
Added delete goal ability

closes #9