"Clean up" MoviesController just to make it nicer to look at. ;-)
Add Movie#runtime and Movie#color?

* `rails g migration AddStuffToMovies runtime:integer color:boolean`
* `rake db:migrate`
* Note the use of `pluralize` in `show.html.erb`
Vastly simplify our existing form through the magic of SimpleForm.

Note that SimpleForm is actually quite flexible, with heaps of customization hooks that we won't go into right now. See the SimpleForm documentation for details.