content css clean up
moved calendar css to separate file
moved wiki css to separate file
Merge branch 'dev' into feature/clean_up_content_css

Conflicts:
	app/assets/stylesheets/default.css
Footer css uses sass variables
moved mor css rules to sass with variables
Merge branch 'dev' into feature/clean_up_content_css
Moved most of link related stlyes to separate file
Moved context_menu css to sass file
Changelog for 3370
Merge pull request #792 from opf/feature/clean_up_content_css

Feature/clean up content css