Workout List Implemented

*Added Workout Linked List
*Created the ability fort the user to create workouts from the
create new workout view controller
//TODO: There is a memory leak with this commit. What needs to happen
is that all database entries are loaded up one time and the linked list
is build around those entries. Currently the workouts view controller
is loading from the database every time on viewDidLoad causing sqlite3
to have to do a lot of unnecessary work that should only be done once.
This needs to be fixed.