Fix to basic auth via bob swift tools failing.

[cooperaj]

1.   Remove the code to process login() calls, and instead call the com.atlassian.confluence.user.ConfluenceAuthenticator login method.  login() does not seem to get called when authenticating via mod_shib, but does while authenticating via basic auth.  This fixes the issue in #30.
   

2.   Move a section of code from getFullName to updateUser() so it can check if the user has an existing displayName before falling back to username.  This prevents the display name in Confluence being overwritten if the IdP does not supply it and it has been manually updated in Confluence.
   

[cooperaj]

This was carried out by a contractor we brought in. I'll be able to manage any requested changes but we do know at this point that the code works as intended.

[garysweaver]

@cooperaj Thanks for your contribution!

Considering the potential impact of this change to others, we'll need to do a beta release and have the community test that before releasing as final.

Can you first send me (here or at my personal email to be more secure) what features of the authenticator you are using with the modified version (create user, update user, etc.) in production currently that you have tested successfully?