Print implementation

Added .hidden-print on various elements
Print specific css styles
Merge branch 'master' of github.ugent.be:Universiteitsbibliotheek/lludss-interface

Conflicts:
	app/views/catalog/show.html.erb
	app/views/databases/index.html.erb
Merge branch 'master' of github.ugent.be:Universiteitsbibliotheek/lludss-interface