private contests don't shown on the homepage
some improvements for mobile layout
Refactoring.
merge slider-for-homepage
Fixed images selection
Merge branch 'ui' into slider-for-homepage

Conflicts:
	public/css/less/layout.less
	public/js/common.js
	views/contests/list.ect
	views/i18n/ru/messages.json
	views/root/index.ect
hand merge with ui
fix for merge
Fixed slider.
Fixed list page, added special conditions helpers.
Fixed message for not allowed users.
Fixed angular for detial page.
Added functionality for changing rate.
Fixed arrows.
common.js refactored
Fixed tests.
added some functionality for manage user groups
hand merge with dev