Ruby2.0: add "require 'yaml'" to Gemfile
On ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]: <pre> $ ruby script/about There was an error in your Gemfile, and Bundler cannot continue. </pre>
Authored by: tmaruyama 2013-02-26
Parent: [r11487]
Child: [r11489]