Use videojs gem for better asset pipeline support
Don't upload levels to db for staging.
Merge pull request #646 from code-dot-org/use_videojs_gem_for_assets

Use videojs gem instead of vendor/ hacks
use dynamic url for root path of development mode instances
Merge pull request #648 from code-dot-org/custom-level-staging

Don't upload levels to db for staging.
Merge pull request #650 from code-dot-org/development_root_url

use dynamic url for root path of development mode instances
Automatically built.
Get rid of solution_level_source and just use properties[:solution_source]