Added publishing functionality to Pubsubhubbub

Added the functionality of sending the alert to Pubsubhubbub.

Right now we have all the valid info only about pubsubhubbub . Will add a broker table later as and when more brokers are available.
No, he did not ;) URL() is still getting the request data (e.g. controller/function) from current.request rather than r.

current.request and URL() are somewhat the same thing.