add electron mod to ensure proper vars set for build

mods/electron/init.js

@@ -0,0 +1,9 @@
+/**
+ * for electron standalone build support
+ */
+module.exports = function(server) {
+    // insert script before all others in kiri client
+    server.inject("kiri", "electron.js");
+    // insert scripts into mesh client
+    server.inject("mesh", "electron.js");
+};