/users/update
This web service allows you to update basic user profile information.
It expects the following required parameters:
username : username
pw : password
And the following optional parameters
firstname : First Name
lastname : Last Name
description : profile text
skype : Skype handle
facebook : Facebook profile URL
linkedin : Linked in profile URL
proz : ProZ username
www : website or blog
It responds with a simple 'ok' or 'error' message if the login is not valid