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Fix simple_grader when input is not consistent
Merge branch 'master' of githubGuillaume:UCL-INGI/INGInious
Allow to submit an empty list to a multiple-choice problem
Ignore new tasks
Add a queue for jobs that are "hard" (which requires lots of ressources)
It lacks a footer.

Based on http://ryanfait.com/resources/footer-stick-to-bottom-of-page/
Reloading a submission which contains radio/checkbox input now works correctly
Fix affix column with the new footer
id -> class
Some CSS/Javascript goodness
New cache system.
Move course files. They are now called course.json and are in the folder of each course.
Typo
Allow to create new type of task descriptions