many changes in templates
add Lector view on Lesson page
add Lessons views on Lector page
add active state to list items
add some @media queries for mobile version
Merge branch 'feature/mobile_version' into develop
Merge branch 'feature/redesign' into develop
fix bug with not displayed Lessons on Lector page

don't know HOW but I lost this changes
add scrollToTop on item list click
add grunt for css optimization
add grunt minify css and js
improve Student edit controls
remove debug flags
change Ember version to latest Production
Merge branch 'release/0.3' into develop