Adding variable definition for $dryadrelease (adapted from themes/Dryad/DryadFooter.xsl)
Fixed link text and destination URLs for 'Dryad Terms of Use' (policies) and 'Contact Us' links.
Merge remote-tracking branch 'origin/trello-34-jima-footer' into mergeme

Conflicts:
	dspace/modules/xmlui/src/main/webapp/themes/Mirage/lib/xsl/core/page-structure.xsl