Adds custom field to News RSS feed.

[matt-bernhardt]

Fixes #36

[PBruk]

Tagging @matt-bernhardt for code review: Fixes #36

[matt-bernhardt]

A few things:

• Can you add some conditional checks or scope these functions in some way? Right now, my concern is that these will add empty tags to feed items that don't have these fields populated.
• the_content_rss has been deprecated in favor of the_content_feed per https://codex.wordpress.org/Template_Tags/the_content_rss - can you switch this to use the newer function?
• Line 255 needs to be split up into multiple lines, and the second part (an echo statement inside a conditional) seems like it may be debugging-related? The function returns a $content variable, so I'm not sure why an echo is needed as well.

[PBruk]

@matt-bernhardt, I made changes according to the comments you posted.

[matt-bernhardt]

Hmm...looking at what's being produced on the test server it seems like this may need some more work.

The subtitle and perhaps the date field are being echoed in places that prevent the feed from validating. When I load the overall feed (/news/category/1/feed/) on the test server, I see the free text between the and content:encoded elements, which looks like the subtitle and a nonsense event date. This invalidates the feed, which may cause problems with some readers.

Event dates aren't being included where needed. Again on the test server, there is an event on 4/20/2015 about "everyone needs an octopus". When I locate that item in the feed at /news/events-feed/ I see no mention of that date.

[PBruk]

@matt-bernhardt, I converted the jQuery date-picker field into PHP and this seems to have fixed the problem.