Add travis config
Add travis config

mawatech/postfix,chrisjbray/postfix,yakara-ltd/postfix,opscode-cookbooks/postfix,mawatech/postfix,chef-cookbooks/postfix,voroniys/postfix,zuazo-forks/chef-cookbooks-postfix,chrisjbray/postfix,gnowxilef/cookbook-postfix,mlyndaker/postfix,gnowxilef/cookbook-postfix,zuazo-forks/chef-cookbooks-postfix,opscode-cookbooks/postfix,voroniys/postfix,yakara-ltd/postfix,interactive-investor-ltd/postfix,interactive-investor-ltd/postfix,chef-cookbooks/postfix,mlyndaker/postfix