Add ability to stream multiple answers per job.

New status of a job, CONT:
when CONT is encountered, the parameter is sent back to the client
and the client should be ready for more information.

The COMPLETE: status may or may not have a parameter attached to it,
that is left up to worker implementation.
Added client base class.

New client class to interact with workers as a client and not using
the HTTP interface.

New worker to stream data to client (random.php)

New sample client to demonstrate stream abilities.