We have created a demo regarding users management in regards the requirements of a challenge posted in a group in Facebook https://www.facebook.com/groups/2322832835/permalink/10157871154867836/ and we have deployed in our implementation in our demo server at https://demos.lucentinian.com/usersdemo/
Specification and development documentation has been added to the users demo web page.
Feel free to play with it, and do not hesitate to send us your feedback.