load analytics in ajax
optimize db query in analytic building
add index for analytic
add complexity for each question in Quiz Analytics
add group info in quiz analytic
add sort by name and group in quiz analytics
Merge remote-tracking branch 'upstream/master' into optimizeAnalytics

Conflicts:
	src/uLearn.Web/Scripts/_references.js
Merge pull request #5 from Tinkturianec/optimizeAnalytics

Optimize analytic