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
Whitespace fixes
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