Add docs for Octopress.
Added support for octopress-config option and docs_mode
Now serving plugin documentation.

When octopress docs is run from within a Jekyll site, it will require
all plugins listed in the _config.yml gems array, ensuring that any
Octopress Ink plugins in the gems array will be able to add their
documentation assets to the octopress docs site.
version bump
Added dependencies on octopress-ink and octopres-codefence to make fancy Ink docs work
removed generated _site file, whoops.
Removed need for _octopress.yml docs_mode: true
Merge pull request #26 from octopress/docs-command

Add docs command for Octopress