Merge pull request #28 from jhamrick/master

Fix ipython dev version
Add recursive option to nbgrader assign and nbgrader autograde
Fix aliases in formgrade app
Update docs
Add directory format to formgrade
Add some api helper functions
Use templates instead of javascript
Handle case where there are missing submissions
Styling
Update docs
Don't link to missing submissions
Remove font awesome link
Fix bugs with previous/next, add tooltips and some formatting
Make sure to include the correct base aliases and flags
Look for static files in the correct places
Merge pull request #30 from jhamrick/recursive-autograde

Recursive autograde