fix iptables rules for xip.io port redirect
Call racker with `rbenv exec ruby` when not using `rbenv exec bundle exec`.
Clean up racker spawning from @ysbaddaden.
Merge pull request #21 from scupen/master

Fixed iptables rules for xip.io support.

Adds two new rules that redirects incoming requests on
ports 80 and 443 to ports 20559 and 29558 respectively.
Merge pull request #25 from dyson/fix-rbenv-no-gemfile

Fixes rbenv support when bundler isn't used.
Merge remote-tracking branch 'origin/master' into refactor