Comment 1 for bug 1423585

See http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/dbs/lp1423585_open_graph_protocol for a working branch that adds rudimentary Open Graph Protocol markup to record detail pages and library pages.

We also change the simplistic "metalinks" scalar variable into a ctx.metalinks list variable so that we can iterate over it and ensure that it's available to populate on every page in the TPAC.