Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/postfix/templates/default/aliases.erb

@@ -0,0 +1,10 @@
+#
+# Auto-generated by Chef.
+# Local modifications will be overwritten.
+#
+# See man 5 aliases for format
+postmaster:    root
+
+<% node['postfix']['aliases'].each do |name, value| %>
+<%= name %>: <%= [value].flatten.map{|x| if (x.include?("@")) then x else %Q("#{x}") end}.join(', ') %>
+<% end unless node['postfix']['aliases'].nil? %>