Remove comments from _ruby recipe.

These comments are probably unnecessary and may have been used for
chruby prior to using the
https://github.com/ichilton/chef_chruby_install cookbook. Since this
cookbook is used, both of these lines are handled by the
chef_chruby_install default recipe.
Merge pull request #70 from drag00n/drag00n/removecomments

Remove comments from _ruby recipe.