Improved contact list item at semantic point of view.
Merged branch 'master'  into friends_section.
Added a few classes more to implement custom icons(in buttons and inputs).
Fixed autoprefixer settings.
Removed a few useless style rules.
Renamed icons to more correct names
Exclude csslint task from watch and validate task because of errors. Until errors would be fixed. Task is still available for direct running.
Improve semantic and design of contact list item.
Merge branch 'friends_section' into muster and solved the conflicts