lergo-341 : Ability to shuffle order of questions in quiz - phase 1
lergo-336 : 2. When creating a question - 
2.1 There will 2 checkboxes, one for "practice" and one for "test", with
the check as default is in "practice", 
2.2. when user checks "test" it unchecks "practice" or when user
"unchecks" "practice" it checks practice (i.e. a check will always be
marked in one of those boxes).
2.3 There will be a tip: 'Note: In 'practice mode' feedback is given
after each question and in 'test mode' only at the end of lesson' (we
should implement the tip that it opens when you click on  as we did for
video tip, or for disabling shuffling for questions).
Merge pull request #145 from lergo/lergo-341

lergo-341 : Ability to shuffle order of questions in quiz - phase 1