[EasyTask] RSS 1.0 (RDF) support

[Phyks]

This is an easytask, something beginners can fix quickly, to have a first look in the code. All the necessary information to solve this issue should be given and it should be pretty much straightforward.

RDF feeds are not parsed, such as the debian security feed.

These are old feeds and Freeder only handles RSS 2.0 and Atom for now. However, this should not be a big deal to add support for these feeds, as most of the difference is just a namespace extension. I need to use fully Freeder instead of Leed, so I can work on it (probably around 20/08). Feel free to work on it in the meantime if you want.

Description:
AFAIK, the problem comes from feed2array which returns false for such a feed. I think the problem is due to the first switch which distinguishes rss, ATOM and default cases for the first tag in the feed. However, with a RDF feed, the first tag is rdf, falling into default case and thus returning false. First, rdf case should be added to this switch. Then, RDF feeds should be parsed almost the same way as RSS feeds, so just a few corrections below to ensure everything is working nicely, and some tests.

Some links, for myself:

• https://stackoverflow.com/questions/16538666/in-php-create-an-atom-feed-from-an-rdf-based-rss-feed

[Phyks]

Started to implement it, but still some work to do.

[Phyks]

Backend feed2array handles them now. To be tested further.

[Phyks]

TODO: guid + date are not working

[Phyks]

Closed by abe41de.