Share and download styling + minor style fixes

The last sprint includes new icons for asset-tools. Also new styles for dropup boxes.

LP#15771745
Dummy content in main menu removed
Merge pull request #43 from NationalMuseumofDenmark/angular

Dummy content in main menu removed
Merge branch 'FrontendSprint2#15771745'

Conflicts:
	app/includes/mixins.jade

New icon for share was conflicting. Solved by using the new one.

LP#15771745
Merge branch 'master' into testing

Update testing with new icons for download and share.

LP#15771745