update to google analytics supplied by Google circa 2014-12.

it appears that you must upgrade to 'universal' analytics on
the google side, but that this is the default for new accounts.

accordingly, I've left the existing google-analytics call intact,
but added a new google-universal-analytics call, and changed the
README's and templates to refer to the new one.
Merge pull request #118 from jbclements/master

update to google analytics supplied by Google circa 2014-12.