Revised footer and message strings for Dryad redesign

Ryan, this is the revised footer for Dryad. I've validated the XSL with 'xmllint', but I can't see the result until this is merged with```dryad-dev```. I gather othes are branching/merging from ```dryad-staging```, so feel free to redirect if I'm on the wrong track here.

One other thing: I've modified some of the footer strings in ```i18n/messages.xml```, but I stopped short of adding new ones, so there's still some "static" text in the revised footer. Let me know if I can/should create new message strings instead, and if so, whether I need to notify others for i18n purposes.