Changed `list` to `index` and update (hopefully) all references and use path helpers
Refactoring tree_display views
Fixed path and refactored another file
Refactored courses_folder_actions route helpers
Made more CRUD-like and made associated changes to seeds.rb and added migration.
Update more path helpers for tree display views
Change migration logic - create new index controller action and delete all others with tree_display site_controller
Change form to use GET request so that index is used
Add groups hash to convert session variable names to database label syntax
Delete some comments and fix general tree_display view (session var)
Revert drill route, fix helpers/params
Correct previous routing helper change
Update hashing syntax (remove rocket operator)
Remove extra empty lines
Remove another extra comma

Conflicts:
	app/views/tree_display/_page_footer.html.erb
Remove extra comma

Conflicts:
	app/views/tree_display/index.html.erb
Replace use of instance variables with local variables.

Also introduce additional local variables to fix selected fields remaining selecte (previously
the instance variables they used were never set)

Conflicts:
	app/views/tree_display/_page_footer.html.erb
	app/views/tree_display/index.html.erb
Remove instance variables (unused) from controller - forgot to include in previous commit
Merge branch 'e1463' into rails4