Adding new plugin Code Include

This plugin allows you to include other files as a code block with
syntax highlighting in ReST articles. You'll need docutils>0.10, as
there was a circular import bug in the 0.10 release.
Some minor tweaks: documentation, py3 compliance

Pulled most documentation out of code to avoid desync
Fixed unicode literals
Fixed except syntax for py3 compliance
PEP 8 fixes
initial commit of disqus_static plugin, a plugin for allowing you to fetch disqus comments from their API and embed them into your templates at HTML generation time.
fix README markdown display
make the disqus_static plugin work for sites with over 25 comments
Whitespace fixes
add support for child posts
Ability to add latex to pages
Correct error in documentation
Don't enforce the licence to be AGPL.
Also update the LICENSE file
Merge remote-tracking branch 'upstream/master' into add_code_include
Restructured to account for repo layout change
Removed docstrings to avoid doc duplication.
Merge pull request #11 from cdunklau/add_code_include

Adding new plugin Code Include
Merge pull request #22 from barrysteyn/master

Ability for latex in page
Merge pull request #12 from idyedov/master

disqus_static plugin
Move disqus_static out of pelicanext
Skip static content for toc extraction