Ignore .scssc files
Rename all instances of "default-html" to "test"
Add container divs to sections and articles

Allow sections and articles to be full width, with content centered
using a container div.
Update to CodeKit 2 and Autoprefixer

* Replaced Bourbon includes with unprefixed properties and used
Autoprefixer option in CodeKit instead.
* stylesheet.css – updated output using latest version of SASS in
CodeKit 2.
* config.codekit – config file new to CodeKit 2.