Bootstrap nan before util addon build

package.json

@@ -9,6 +9,9 @@
     "type": "git",
     "url": "https://github.com/somerandomcryptoguy/node-cryptoforknote-util.git"
   },
+  "scripts": {
+    "install": "npm install --no-save --ignore-scripts nan bindings && node-gyp rebuild"
+  },
   "dependencies": {
     "base58-native": "*",
     "bech32": "*",