Load the Buzz library for the client demos.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Change the password of the Client created by LoadUserData.

That was necessary in order for us to know the original password, too.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Authenticate the Client using the HTTP Basic Authentication scheme.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>