Alphabetize static site generators

README.md

 ## Static Site Generators
 *Tools for pre-processing content to generate web pages.*
 
-* [Sculpin](https://sculpin.io) - A tool that converts Markdown and Twig into static HTML.
+* [Couscous](http://couscous.io) - Couscous turns Markdown documentation into beautiful websites. It's GitHub Pages on steroids.
 * [Phrozn](https://github.com/Pawka/phrozn) - Another tool that converts Textile, Markdown and Twig into HTML.
+* [Sculpin](https://sculpin.io) - A tool that converts Markdown and Twig into static HTML.
 * [Spress](http://spress.yosymfony.com) - An extensible tool that converts Markdown and Twig into HTML.
-* [Couscous](http://couscous.io) - Couscous turns Markdown documentation into beautiful websites. It's GitHub Pages on steroids.
 
 ## HTTP
 *Libraries for working with HTTP and scraping websites.*