Added nice outputs comparer and success answer has no output anymore.
Merge branch 'master' of https://github.com/kontur-edu/uLearn

Conflicts:
	src/uLearn.Web/Controllers/CourseController.cs
	src/uLearn.Web/Models/RunSolutionResult.cs
	src/uLearn.Web/Scripts/slide.js
	src/uLearn.Web/Views/Course/Slide.cshtml