Merge pull request #1 from NZem/master

Add 'sort' and 'match' questions
Merge branch 'master', remote-tracking branch 'origin/master'
Upgrade to jQuery 1.9 and jQuery UI 1.10
Simplify code, remove unneeded 'label' tags for sortable and match questions
Use answer variants distinguishable from indexes in test quiz
Show variant texts instead of indexes in check table
Extract makeVariants helper function
Match question in table instead of 2 lists