added "new style" analytics to google analytics
see
https://developers.google.com/analytics/devguides/collection/analyticsjs/advanced
in particular, note:
"It is perfectly safe to include both ga.js and analytics.js snippets on
the same page."
Merge pull request #25 from calfzhou/latex

Add latex support.
Add license
Merge pull request #24 from keflavich/analytics

Added "new style" analytics to google analytics