Fix iframe (youtube) for IE
Use rails env for default pretty print blockly.
Use fetch with default, fix interpolation, fix file ending for mime type.
Added an og:tag that points to the sharing_drawing image in level_source.html.
Merge pull request #222 from nanan9177/sharing

Added level source into response for sharing.
Using dynamic header generation for og tags.
Merge pull request #229 from nanan9177/sharing_pic

Sharing pic
Merge pull request #224 from tobyk100/master

Use rails env for default pretty print blockly.
[Finishes 62488578]: change Dropbox storage -> Dropbox space, remove iTunes prize references
Merge branch 'master' of github.com:code-dot-org/dashboard
Reveal DonorsChooser.org teacher prize specifics
These scripts live on archive.learn.code.org, and are used to pull log files and count lines of code
Protect log sync from running more than 1 at a time
Merge pull request #231 from code-dot-org/enable_donorschoose

Reveal DonorsChoose.org teacher prize specifics
Added an image field in level source, and use that image to generate the og tag page.
WIP. Showing image for og tag.