Vendor the external cookbooks

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

cookbooks/nginx/templates/default/modules/authorized_ip.erb

@@ -0,0 +1,6 @@
+geo $<%= node['nginx']['remote_ip_var'] %> $authorized_ip {
+  default no;
+  <% node['nginx']['authorized_ips'].each do |ip| %>
+  <%= "#{ip} yes;" %>
+  <% end %>
+}