cook-189, use 'set_unless' for compatibility, but may switch to 'default' later
cook-189, use 'set_unless' for compatibility, but may switch to 'default' later

hw-cookbooks/erlang,RSEmail/erlang,christophermaier/erlang,jgoldschrafe/erlang,behanceops/erlang,PrecisionDevelopment/erlang,cheeseplus/erlang,naoya/erlang,sigma-random/erlang,mancdaz/erlang,jgoldschrafe/erlang,Amplify-Social/erlang,fernandohonig/erlang,SpeCT/cookbook-erlang,KirstensAmazing/erlang,tas50/erlang,cheeseplus/erlang,fernandohonig/erlang,SpeCT/cookbook-erlang,PrecisionDevelopment/erlang,behanceops/erlang,FishkinsDC/chef-erlang,michaelklishin/erlang,cookbooks/hw-erlang,jtimberman/erlang,VertiPub/erlang,cookbooks/oc-erlang,naoya/erlang,dosyfier/erlang,sigma-random/erlang,relaynetwork/erlang,DonorsChoose/chef-erlang,opscode-cookbooks/erlang,opscode-cookbooks/erlang,chef-cookbooks/erlang,michaelklishin/erlang