First commit of multi.  It's temporarily listed in 20hour curriculum, with a blank game page.
First multiple-choice looking questions, just in haml for now.
Merge branch 'finished' into multi

Conflicts:
	lib/tasks/seed.rake
Merge branch 'finished' into multi
Add draggable multi prototype.
Merge branch 'finished' into multi
Merge pull request #468 from code-dot-org/finished

deploy to delivered
Two multis in a single stage.  Each loads its content from a separately yml file that is generated from a .multi text file.
Merge pull request #475 from code-dot-org/finished

deploy to delivered
Merge pull request #476 from code-dot-org/finished

deliver
Level builder and script builder with DSL.
Add autogen warning.
Refactor for readability. Wrap custom level task in transaction.
Add autogen warning. Refactor for readbility.
Regenerate
test
Merge pull request #478 from code-dot-org/finished

Finished to Delievered
Merge pull request #480 from code-dot-org/finished

Finished to Delievered
Merge pull request #481 from code-dot-org/feedback_collect

More test fixes.
Merge pull request #482 from code-dot-org/finished

Finished to Delievered