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

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

deliver
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 #482 from code-dot-org/finished

Finished to Delievered
Merge pull request #486 from code-dot-org/finished

deploy to delivered
Merge pull request #489 from code-dot-org/finished

deploy to delivered
Merge pull request #492 from code-dot-org/finished

deploy to delivered
Merge pull request #493 from code-dot-org/finished

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Merge pull request #496 from code-dot-org/finished

deploy to delivered
Merge pull request #499 from code-dot-org/finished

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Merge pull request #515 from code-dot-org/finished

deploy to delivered