Update grunt-contrib-cssmin.
Properly disable uglify-js' warnings.
Use Jekyll's built-in variable for the year.
Add a retina navbar logo.
Merge pull request #29 from mpc-hc/retina-img

Retina images.
Update dependencies.
Use the shorthand property for `background-size`.
Give more space between links for mobile devices.
Mark external links as such in news.
Fix #30.
Update dependencies.
Update dependencies.
Revert "Switch to the SVG dependency badge."

This reverts commit a3eae2abc84bb8731387b191a489e9e9583958b4.
Slightly compress images more with kraken.io.
Move CSSLint options to .csslintrc.
Update dependencies.
Add `travis_retry` to the install commands.

http://blog.travis-ci.com/2013-05-20-network-timeouts-build-retries/
Make the html validation task fail if there are errors.
Switch to using `icon` instead of `shortcut icon`.
Update README.md for Jekyll 1.5.0.