Promise-way sandboxed context module preloading and then executing code.

promiseModuleSandboxExecutor.js

// It is not yet another reinventing the well.
// Did you ever see what's happens with module that requires lots of times in 
// a row for example in Express?
// Check it out and come back!
Promise.all(['module1', 'module2', 'module3']
  .map(x => System.import(x)))
  .then(([module1, module2, module3]) => {
    // Do something in separate scope.
  });