Fix bug where bins get sourced instead of added to /usr/local/bin:/Users/Oliver/.rvm/gems/ruby-1.9.3-p362/bin:/Users/Oliver/.rvm/gems/ruby-1.9.3-p362@global/bin:/Users/Oliver/.rvm/rubies/ruby-1.9.3-p362/bin:/Users/Oliver/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Users/Oliver/.rvm/bin