Move packages to root dir from src/

This is supposed to work slightly better with go import paths. I think.

function-run/nodejs/test/test.js

@@ -0,0 +1,5 @@
+module.exports = function (context, callback) {
+  console.log("Test function entered");
+  callback(200, "Hello, world!\n");
+  console.log("Test function exit");
+}