add Shifts
refactor Shifts
refactor Shows
convert skill categories to lowercase (ease of use)
Improve member selections crewable / castable
add pry gem to development environment
Create join table to link Actors and show (actors_shows)

I was trying to use Shifts for this, with a skill of ACTOR, but it
just isn't playing nicely, so this became the simplest solution.
add Cocoon gem for dynamic add/remove in forms

This works cleanly with Chosen and turbo links, whereas our homespun code did not.
Refactor javascript
remove scenes from Show creation

Temporarily remove scenes from the show creation form.
I think this functionality may be better suited by providing another interface for it's creation.
fix tests
add fullcalendar-rails gem
begin add conflicts
separate date structure into components for Conflict