Make python code collapsible:

- Remove unused code: https://github.com/getpelican/pelican-plugins/issues/140
- Add javascript and CSS to header to toggle code areas
- load jinja2 template from file
add jinja2 template file to have collapsible python code
Merge branch 'master' into collapse-code
remove unnessecary replace from template, require white space after hash
get jquery via https from google's cdn
Maintain backward compatibility by not requiring that pelicanhtml is copied to the blog home
Explain new collapsible code cells feature in Readme.md
alert user to incorrect usage of typogrify
Merge pull request #170 from barrysteyn/master

render_math plugin: alert user to incorrect Typogrify usage
Add Python 3 compatibility
add static_comments plugin
Merge pull request #172 from jesrui/static_comments

Add static_comments plugin
Merge pull request #171 from ariddell/patch-1

Add Python 3 compatibility to render_math plugin
Grammar and PEP8 fixes for render_math plugin
New vimeo tag.
Merge pull request #174 from svenkreiss/master

Add Vimeo support to liquid_tags plugin
support IPython 2.0 in notebook liquid tag

The only relevant changes seem to be a few renamed classes, and changed signatures.
adjust embedded notebook CSS for IPython 2.0

remove text-cell prompt and padding, so it aligns with outer body text
Merge pull request #175 from minrk/ipython-2.0

Support IPython 2.0 in notebook liquid tag
Fixed errors arising from Python 3.x