[dev] Fixing the Horde_Feed tests

[Chuck Hagenbuch]

Quoting Gunnar Wrobel <wrobel at horde.org>:

> Hi!
>
> Currently the Horde_Feed tests are failing in the blogroll tests  
> (locally for me, on ci.horde.org and for Jan as well). The attached  
> patch fixes the issue but I admit I have no clue why the node  
> attributes should be case-insensitive. As far as I understand it the  
> OPML should be considered to be XML with case-sensitive attributes.  
> Does anyone have a clue if the attached patch makes sense or not?

I'm pretty sure they worked at some point, but they fail for me now  
without this patch and pass with it, so I pushed it. Thanks!

-chuck