Allow to create a package and install a package compiled from GitHub

Also add nginx config for reverse proxying and set up Let's Encrypt
automatically

site-cookbooks/kosmos-parity/recipes/node_testnet.rb

@@ -13,6 +13,7 @@ parity_node "testnet" do
   password credentials["testnet_password"]
   config parity: {
            chain: "ropsten",
+           no_download: true, # Don't Download Updates
          },
          network: {
            port: 30304,