support RSS2 with enclosures

[skippy]

If we want Habari to be useful with the podcasting crowd, we need to support RSS2 with enclosures. This is the format that iTunes uses, and is the de facto standard.

[ringmaster]

This isn't a question of whether RSS2.0 is good enough to be included. This is a matter of including a feed type that is currently required to produce functionality that is necessary to achieve project goals.

I assume that certain inclinations will be to omit RSS2.0, but it will be more helpful if those comments could be refocused to produce the most compatible/functional RSS2.0 feed that we can.

[michaeltwofish]

There is now an RSS plugin in -extras that has all the appropriate hooks for adding enclosures. Podcasting issues should now by new tickets, or comments added to #9.