Introduced view mode switch (grid/list view options). Refactored css class names.
Merge branch 'master' of https://github.com/TobiasScharnowski/OrderIT

Conflicts:
	src/main/webapp/WEB-INF/jsp/categories.jsp
	src/main/webapp/WEB-INF/tags/articlelist.tag
	src/main/webapp/resources/css/List.css