[sitemason-developers] Better handling of RSS subscriptions

[Tim Moses]

I added error messages when subscribing to an RSS feed in the News
tool. Before, if a feed was invalid or unavailable, no message would
come back. Now there is an appropriately worded message.

One of the problems I have encountered is that some hosting providers,
like AOL, block requests that look like they are coming from LWP or
some other library to prevent spam or abuse. In general, that probably
works well for them. However, when it comes to exporting RSS feeds,
their security needs to be a little more lax since there are many
valid reasons for using scripts to read feeds and not a whole lot of
spam activity related to simply reading an RSS feed. To put it simply,
the purpose of an RSS feed is to make the information available to
everyone, so don't slap a bunch of general purpose security on it.