addition of jigsaw app with a few levels
Prefill x, y, start_direction
Fix line break ruby -> javascript issue
Sanitize param data.
Use escape_javascript instead of gsub as it is more idiomatic.
Set x, y, start direction to nil if no integer provided
Add tests.
Add fourth level
add pagination to admin/gallery page
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Merge branch 'jigsaw' into finished

Conflicts:
	lib/tasks/seed.rake
Merge pull request #451 from code-dot-org/gallery-again-again

add pagination to admin/gallery page
Merge pull request #454 from code-dot-org/finished

dtd
forgot to check in file
Merge pull request #455 from code-dot-org/gallery-again-again

forgot to check in file
Merge pull request #456 from code-dot-org/finished

fix tests
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Merge pull request #457 from code-dot-org/finished

blockly finished to delivered
Merge pull request #435 from code-dot-org/edit_start_blocks

Edit start blocks
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