Strip out a few build only files from the rubygems
Strip out a few build only files from the rubygems

Rakefile, tmp, and Gemfile. Pretty simple stuff. Slims down the gem a tiny bit

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

customink/fauxhai,chefspec/fauxhai