Stages
Fix stages. Add tests.
Add non null to name and script_id for stage. Refactor postion vs chapter. Order by stage when present.
Properly hook up related models for testing.
Move stage seed task logic to where it applies to both new and existing script_levels.
Add back acts_as_list
Merge pull request #422 from code-dot-org/stages

Stages
Automatically built.
dashboard changes to support saving drawings to a gallery

Conflicts:
	Gemfile.lock
Two tiny string changes courtesy of Roxanne who reviewed our string files.
fix css typo
Automatically built.
Add workaround for chrome SVG clippath issue [finishes #69016256]
Add more workaround details to header
redo save to gallery using a new table instead of a column on activities
admin report page to see the most recently saved activities
Automatically built.
fix schema.rb
fix admin gallery page
one more bit of cleanup