Made hint string detection in check outcome reasons case-insensitive.
Updated Rails to 3.2.11, and other bundled gems.
Switched back to single built bootstrap.js in vendored assets, and made sure to comment out sprites.less in bootstrap.less since we're using FontAwesome.
Added spinner when making a check attempt so there's a noticeable indicator of action going on.
Added builtins.js from Skulpt.
Various home page and layout updates.
Only allow assignment checks when the assignment offering is not closed.
Only provide a link to the full assignment if there is a longer description.