Thanks to this week's contributors to thoughtbot projects.
Test your Ruby gem against different versions of its dependencies.
Extend Sass with common mixins.
Test Javascript web apps with headless Webkit.
Authenticate users with email & password.
Configure vim, zsh, git, and tmux.
Create Ruby test data.
Program in style.
Set up your OS X laptop for development.
Create a responsive grid with Sass and Bourbon.
Attach files to ActiveRecord objects.
Test common Rails functionality in one line