First steps on converting FeedSub into the pub/sub basis for OStatus communications:

* renamed FeedSub plugin to OStatus
* now setting avatar on subscriptions
* general fixes for subscription
* integrated PuSH hub to handle only user timelines on canonical ID url; sends updates directly
* set $config['feedsub']['nohub'] = true to test w/ foreign feeds that don't have hubs (won't actually receive updates though)
* a few bits of code documentation
* HMAC support for verified distributions (safest if sub setup is on HTTPS)

And a couple core changes:
* minimizing HTML output for exceptions in API requests to aid in debugging
* fix for rel=self link in apitimelineuser when id given

This does not not yet include any of the individual subscription management (Salmon notifications for sub/unsub, etc) nor a nice UI for user subscriptions.
Needs some further cleanup to treat posts as status updates instead of link references.

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+Plugin to support importing updates from external RSS and Atom feeds into your timeline.
+
+Uses PubSubHubbub for push feed updates; currently non-PuSH feeds cannot be subscribed.
+
+Todo:
+* set feed icon avatar for actual profiles as well as for preview
+* use channel image and/or favicon for avatar?
+* garbage-collect subscriptions that are no longer being used
+* administrative way to kill feeds?
+* functional l10n
+* clean up subscription form look and workflow
+* use ajax for test/preview in subscription form
+* rssCloud support? (Does anything use it that doesn't support PuSH as well?)
+* possibly a polling daemon to support non-PuSH feeds?
+* likely problems with multiple feeds from the same site, such as category feeds on a blog
+  (currently each feed would publish a separate notice on a separate profile, but pointing to the same post URI.)
+  (could use the local URI I guess, but that's so icky!)
+* problems with Atom feeds that list <link rel="alternate" href="..."/> but don't have the type
+  (such as http://atomgen.appspot.com/feed/5 demo feed); currently it's not recognized and we end up with the feed's master URI
+* make it easier to see what you're subscribed to and unsub from things
+* saner treatment of fullname/nickname?
+* make use of tags/categories from feeds
+* update feed profile data when it changes
+* XML_Feed_Parser has major problems with category and link tags; consider replacing?