Update for Ticket #1388203

[rockbox]

I have made a small patch to use HTTP Authentication in roundcube.
http://trac.roundcube.net/trac.cgi/ticket/1388203

Can someone give me a clue how to solve the two additional problems mentioned in the ticket.

1. a access denied page is needed to avoid the login loop.
2. a logout page is needed to avoid the login loop.

Maybe someone has a better idea to solve the problem.

greetings from rockbox