[Feed] Re-worked PubSubHubbub
[Feed] Re-worked PubSubHubbub

* Update the code from the extinguished Zend\Controller to Zend\Http

asgrim/zend-http,weierophinney/zend-http,malinink/zend-http,zendframework/zend-http,netroby/zend-http,Maks3w/zend-http