made changes to buttons
made changes to button arrangement
made changes to start page
made changes to renderGrade and added the file dropdown.js for the dropdown menu on the start page
split the grade string into seperate div´s (quiz.js) and fixed quiz.css in response to Jamies comments
update tw.js
now you can show and hide explenation to correct answers in small screens
now you can show and hide explenation to correct answers in small screens
made changes to the help insturctions on the quiz page
made changes to the javascript code that hides the explenation to correct answers on small devices
made changes to buttons and added show/hide detail about grades on small screens
moved the reversing of buttons inside updateActions function and  removed the hide/show correct explanation option on small screens.
Merge remote-tracking branch 'magnearun/master' into tmpmerge

Conflicts:
	lib/quiz.js
	lib/quizlib.js
	tests/test_quizlib.js
	tutorweb/quiz/resources/tw.js
Fix markup
changed the border-radius on #tw-quiz to match the border-radius of the buttons. Changed the show/hide grades link, removed code from javascript and added jQuery to start.html and some css.
Merge remote-tracking branch 'magnearun/master' into tmpmerge
made the font-size of the grade text smaller on the start page
Merge remote-tracking branch 'magnearun/master' into tmpmerge