View and delete logs

nbguzman/Project-LimitBreaker#6
#67 

Things kinda work; there's a problem:
* because there's no relationship between routines & logged exercises, there is no differentiating between logged ExerciseA from RoutineA and logged ExerciseA from RoutineB

In other words, exercises share the same logs, no matter what routine.

We can fix this by:
* creating a relationship between the 2 so that logged exercises are unique to each exercise from different routines

I may have overlooked things (I am tired, very tired right now), so I'll check back on the relationships later. If anyone finds a solution, share it with us.