header_set.__delitem__(): remove a header
header_set.copy(): copy a header set

Bad_Response: new exception

server.start: set the thread name based on self.__class__
server.create_connection: allow the user to override the connection class (for spdy)
tlslite_server.__init__, accept: allow the user to pass handshake_args down (for spdy)

worm.kill(): remove from arena.worms at this point, rather than relying on the try/finally in the thread.

Conflicts:
	coro/_coro.pyx

buffer.set16(): method to set a 16-bit length field after the data is emitted
Packer.addbyte(): call underlying buffer add_byte().
Packer.addstring(): chr() call not needed
Packer.endRR(): call self.buf.set16() to set RR length
Unpacker.getstring(): ord() call not needed
Unpacker.getHINFOdata(): useless, but since addHINFOdata() is there...
Unpacker.unpack(): cut & paste typo

Conflicts:
	docs/tutorial.rst

I am going to merge this pull-request as I am certain it's better than the original linux_poller we have already. 

Conflicts:
	setup.py

Conflicts:
	setup.py

Use distribute_setup.py to help get pip working (and to ensure the correct version of distribute is present).  Distribute>=0.6.16 is required to invoke Cython automatically.
Check for Cython's presence manually: unfortunately the install_requires param to setup will never be seen if Cython is not present (due to the use of Cython's Extension module)

rename register_event to hint that it's private and get read of wait_for_read & wait_for_write as they are duplicate and not used anywhere