add twitter, google plus, and facebook sharing
add sharing info to README
add more twitter options
add google plus options
add default values to social media parameters
add site search
Merge pull request #22 from nhanb/restore-disqus-variables

Restore disqus js variables
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."
Add latex support.
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
Chained `replace` calls

- Remove `https`, then `http`
Fix 'true'/True oddity

- A bit gross (series of filters) but allows us to use booleans in Python, and
  strings in Javascript
First attempt at fixing twitter
Added working twitter example

- Not 100% sure if it mirrors previous setup, but I think it is close
Corrected Google Plus docs
Forgot to add myself as author
Use better pagination url, which is suggested by pelican default theme.
h1/h2 pair mismatch fix