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_path