Updating the RSS feed code

Stacey uses an atom for its default feed code. Updated it so that it
conforms to the RSS 2.0 spec. Looked at how wordpress and other cms
systems create thiers and followed along to create code that will work
in a few other deployment methods.

To make the images work correctly found a support article in the stacey
app support documentation to help create absolute urls, link below.

https://getsatisfaction.com/stacey/topics/how_can_i_get_absolute_image_p
ath