Check for the presence of /usr/include before we consider it okay
Merge master into mavericks-clts for wfarr
Upgrade Rails version

Fixes #37
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
Account for versions of OSX in between major releases

E.g. 10.9.x, 10.8.x
Merge pull request #41 from RapGenius/master

Account for versions of OSX post 10.9
Upgrade Rails to 3.2.17

Fixes #42
Merge pull request #44 from articulate/rails-3.2.17

Upgrade Rails to 3.2.17