Hub needs to support Automatic Subscription Refreshing
Description
Need to support the following spec feature:
http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#autorefresh
Environment
None
Need to support the following spec feature:
http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#autorefresh
