proxy authentication and little patch

Hi,

Tonight I was stumbling over authentication, trying to get through a proxy
with LWP::UserAgent.

The only way I could get this working was by overriding
get_basic_credentials, which seemed a bit overkill for just passing through
a proxy. Upon examination, I found that get_basic_credentials just returned
when encountering a proxy, not bothering to look anything up. It doesn't
have a URL to lookup at that point either.

A little editing made it possible to use:
$ua->credentials('proxy', 'proxy', "username", "password" );
to set the username and password for the proxy to use, which saves hassling
with overriding the function.

Therefor I propose this solution for general use, the patch is attached.

Regards,
Bas

563c563,565
<     return if $proxy;
---
>     if ($proxy) {
>         return @{ $self->{'basic_authentication'}{"proxy"}{"proxy"} };
>     };