Update view to enable multi canvas per page
Merge branch 'scribing-qns' of https://github.com/kxmbrian/coursemology.org into scribing-qns
Add reload background button
Add canvas to individual scribing question edit page so the picture will
also load when editing an individual question.
Merge branch 'scribing-qns' of https://github.com/kxmbrian/coursemology.org into scribing-qns

Conflicts:
	app/assets/javascripts/scribing_canvas.js