Updated truffle.js for Ganache-based tutorials

truffle.js

@@ -1,4 +1,11 @@
 module.exports = {
   // See <http://truffleframework.com/docs/advanced/configuration>
-  // to customize your Truffle configuration!
+  // for more about customizing your Truffle configuration!
+  networks: {
+    development: {
+      host: "127.0.0.1",
+      port: 7545,
+      network_id: "*" // Match any network id
+    }
+  }
 };