Prompt for user data when a js module is loaded

[nitzantomer]

When a javascript based module is loaded, it should have the ability to ask the user for initial data.
The idea behind this is that js modules should be shareable across environments without that need to manually download the file, edit the source, serve it and only then load it.

This is can be mostly useful in cases when the module is a remote module which loaded as a js file to avoid CORS issues, and then it needs to connect to a service/application.
It might need to ask the user for the host/port of the service to connect to, or/and, in case of oauth applications, the api key/secret.