Recipe to support OmniOS

This pull request adds a recipe to install a [DevEnv]() on OmniOS. 

Currently, OmniOS's Ruby package is built with GCC 4.6.3, and the path is hardcoded, as the gcc binaries are not installed in the default $PATH. This means that in order to install RubyGems into the "system" Ruby, one must install `developer/gcc46`