Added new contract templates (#31)

docker/code-templates/nodejs/upgrader-contract/dist/hp.cfg.override

@@ -0,0 +1,6 @@
+{
+    "contract": {
+        "bin_path": "/usr/bin/node",
+        "bin_args": "index.js"
+    }
+}

docker/code-templates/nodejs/upgrader-contract/dist/post_exec.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Install unzip, jq if not installed, because it's required for the upgrader.
+
+if ! command -v unzip &>/dev/null; then
+    echo "Installing unzip"
+    apt-get update
+    apt-get install -y unzip
+fi
+
+if ! command -v jq &>/dev/null; then
+    echo "Installing unzip"
+    apt-get update
+    apt-get install -y jq
+fi