Upgrade zeromq support from 2.x to 4.x
Bug fix: new zmq parameter order

Updated parameter order to avoid zmq_send(): Socket operation on
non-socket error
SPDY2=>3 support, Missing dealer warnings, memory leak fix

Upgraded NPN, dictionary, frames and sizes,
SPDY Version is now stored in bb_connection->spdy, update headers to
deal with colons, added new frame types stubs,
Warnings if dealer is not found,
mod_spdy compatible environment, fixed goaway memory leak, added
comments and removing trailing whitespace
SPDY push bug fix

b_spdy_push_headers fixes, other comment documentation update
Upgraded http_parser library, allow SPDY style headers, zmq bug fix

Updated http_parser then made it accept headers starting with a :,
update zeromq expected response, minor SPDY documentatino update
Sample PHP worker script
Merge pull request #8 from customwebapps/master

SPDY3 support, newer libzmq support, update http_parser, sample php script