New Feature: Search a ChatUser and create a new ChatUser

[Tonterias]

Hi,

We need a couple of related things:

• Search a ChatUser: By first, lastname or login into the JHI_User and show the results so a user can send a first message to that user and it will automatically create a new One2One ChatRoom with the that user. In order to do that, we need to.....
• Create a new ChatUser everytime a new user registers in the app. Right now it has to be done by hand.

Commit and document the changes in the tutorial ; https://www.spingular.com

Now, the API only finds users with a login, no request for lastname or firstname ....

Thanks