Extract category_link filter from category_generator.rb plugin

Allows category_link to be used as a filter to display a link to
any category.
Raise RuntimeError when gist is unavailable
Convert to integer before comparing. data.code is String
Fix for bottom margin in nested lists.
Add EditorConfig file for Ruby files
Add EditorConfig file for classic theme
Added robots.txt, with sitemap link
Added stringex and changed to use #to_url for create directory. To don't receive error in url to accented characters.
optimized order of styles and scripts in header
Updated Github API to V3.

Github API V2 has been removed.  The response data format also changed.
Updated Github API to V3.

Github API V2 has been removed.  The response data format also changed.
Updated Github API to V3.

Github API V2 has been removed.  The response data format also changed.
Updated Github API to V3.

Github API V2 has been removed.  The response data format also changed.
Merge pull request #675 from zlu/master

Update Github API to V3
Twitter API call and links are now protocol relative
Merge branch 'master' of github.com:imathis/octopress
Using https instead of protocol relative urls, for Pinboard and Twitter feeds
Disabled Rsync delete by default. Closes #787
Upgrade ruby version
To support url without domain name like /path/file

You need to know if you would like to support this, each word in the title can not start with "/".