Check for the presence of /usr/include before we consider it okay
Merge master into mavericks-clts for wfarr
Merge pull request #38 from boxen/mavericks-clts

Work around Xcode install before CLT install
Highlight install command on click
Bump Gemfile Ruby to 2.0.0
Merge pull request #40 from articulate/highlight

Highlight install command on click for easier copying