First inklings of schema.org support for library pages

First inklings of schema.org support for library pages

Adds a TPAC page where the information for a given library can be publicly
exposed; in addition, that information is marked up with schema.org structured
data so that, for example, a search engine can offer up the hours of operation
and contact information for a given branch right on the search results page.

We give the content-wrapper a main-content for indentation, to be consistent
with other pages in the TPAC.

We also add the cargo-cult common-full-pad div for a bottom margin.

Signed-off-by: Dan Scott <dscott@laurentian.ca>