cleanly added hpfeeds support

[gregcmartin]

This is compatible with hpfeeds out of the box and has no external dependencies like in the other PR

[desaster]

sorry for my huge delay with dealing with pull requests.

As it is now, the patch uses socket and blocking calls, which unfortunately cannot be used in a twisted application that relies on fully non-blocking operation.

http://twistedmatrix.com/documents/current/core/howto/clients.html