Add github cname preprocessor support.
Adopt stanley theme:

1. see http://www.blacktie.co/2014/01/stanley-freelancer-theme/.
2. change color from green to blue.
3. narrow the navbar height.
4. add bootstrap panels, with box-shadow.
Seperate pandoc code highlight css
Only enable disqus on post layout
Refine style, add solid border in right <aside>
Refine style for post tags
Refine style for post-list in tags and categories page
Add a simple google search button to navbar
Add a back-to-top button.

For technical details, check:
http://www.developerdrive.com/2013/07/using-jquery-to-add-a-dynamic-back-to-top-floating-button-with-smooth-scroll/
please.
Update color
Adjust panel padding and paragraph line-height.
UI refinement.

1. enlarge line-height of ul and ol element
2. set default body background to grey.
Titleize post title when possible.
Refine font and color.

1. Adopt Kaiti for navbar brand when possible.
2. Set letter-spacing for navbar.
3. Add margin to ul/ol element.
4. Refine color.
UI refinement.

1. Adjust some paddings and margins.
2. Set title font to Kaiti When possible.
Set <hX> element's bottom border in post.

This idea comes from github's README.
Merge branch 'theme/stanley'