Added table WeightExercise with a foreign key to Workout so every Workout has a set of WeightExercises.  Weight exercises include fields for the name of the exercise, minimum weight lifted, maximum weight lifted (need not be specified), number of sets and reps, and duration (need not be specified).  Also added additional fields to Workout so workouts are more descriptive
Merge branch 'master' of https://github.com/CSc436/gymjournals into 56WeightExerciseTable
Fixed models.py to be pep8 compliant
Added API view for adding Weight Exercises
Merge pull request #61 from CSc436/APIWeightExercise

Api weight exercise