started working on support for choice of random questions
add html5lib requirement
added tests
Randomized scoring and save working
Scoring of randomized sets done
created Graded Surveys with grades not shown
Added hide-grades checkbox and functionality
added migration for hide-grades bit
fixing chef recipe
Merge branch 'master' of https://github.com/Stanford-Online/class2go into jbau-random-psets
checking in new migration
Hide show explanations button when explanation is empty

Also allows HTML in choice level explanations.
(closes #2193)
Merged with Master
Merge pull request #2381 from Stanford-Online/jbau-random-psets

Jbau random psets