Changed the Gem::Installer::ExtensionBuildError to a Mixlib::ShellOut::ShellCommandFailed to temporarily band-aid the error that causes new Chef versions to miss the chef-solo workaround
Added old exception rescuing style as well 

Added (Gem::Installer::ExtensionBuildError, Mixlib::ShellOut::ShellCommandFailed => e) to rescue block.
Merge pull request #169 from SimonKaluza/develop

Changed the Gem::Installer::ExtensionBuildError to a Mixlib::ShellOut::S...