Restore GET method for news feed xhr.

Merged Ralph Giles requested to merge nginx into master

The site was using POST to fetch the rss feed for display on the landing and news pages to work around aggressive caching in the apache webserver config.

Since the since was migrated to nginx this method no longer works. We're not aggressively caching, so GET works fine. If we do, an exception should simply be made for these files and/or a server reload should be triggered on update.

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