Feature request: override feed title

[c-alpha]

Hi,

first of all: elfeed is absolutely awesome. Many thanks for all the efforts that went into it!

To further the convenience even more, I'd like to be able to override feed titles. My prime example is the CNN news channel, whose feed http://rss.cnn.com/rss/edition.rss prides itself as "CNN.com - RSS Channel - App International Edition", which IMHO is a ridiculously baroque feed title. I would like to be able to override this with just "CNN".

My current config contains this:

 (elfeed-feeds
   '(("http://rss.cnn.com/rss/edition.rss"              news general)))

To make it a backward compatible change, you could for instance allow the first element to optionally also be a list instead of a string:

 (elfeed-feeds
   '((("http://rss.cnn.com/rss/edition.rss" "CNN")      news general)))

This would probably mean an (if (listp ... or similar, somewhere?