Implement HTTP header Content-Encoding
Implements handler_zeromq

This handler receives HTTP POST messages, and sends these messages over
an ZeroMQ channel to a broker. This allows an ordinary webserver to
receive messages, while the distribution is happening outside the realm
of the webserver. Currently handler_zeromq is implemented as PUSH socket.
Implementation of handler_tmi

This handler is specific implementation of handler_zeromq that
acknowledges incoming messages. It implements the Dutch public
transport interface "TMI". While not really useful for the
international market it might give some inspiration.
Merge remote-tracking branch 'cherokee/handler_tmi'