WIP: another stab at form actions.
Extra controller spec
Trying Ignacio's approach
Merge branch 'master' into animation-pane-ajax
Working enable/disable for AnimationPane params

[#46045405] This completes the working form for adding xMin and xMax to the AnimationPane conditionally. Note that the form has moved out of front_site.dryml and into the views themselves.

https://www.pivotaltracker.com/story/show/46045405