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

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

In short: epoll royally sucks.

The longer version: epoll doesn't allow 2 separate events to be
maintained per fd. If we register an fd for read, and then decide
to register it for write too, the later will overwrite the original
registered read event unless we register READ|WRITE. It seems
harmless but it's not. When we register for READ|WRITE and only
a READ event arrives, we first receive the READ event, and in the
next epoll_wait if a READ + WRITE event occurs we'll receive READ|WRITE
because the original registered event is READ|WRITE. What this means
is that we received READ twice here, once as READ and the second
time when a WRITE & READ occured, READ|WRITE. We were not expecting
the second READ event and w'ell have to ignore it.

This behavior happens because we are not passing EPOLLONESHOT. The
reason we don't want to do this is that the EPOLLONESHOT will get applied
to both events (read + write) when we only need it for one. Ex: If we
register for a READ event, followed by registering WRITE event
READ|WRITE|EPOLLONESHOT this will mean if either of the READ or WRITE
event occurs it will be EPOLLONESHOT and the second event will need
to be registered. I certainly don't want to track such events and
reregister them. Hence I am going with the first solution
by not use EPOLLONESHOT and ignore events I am not expecting.

If only epoll supports fd+event as a key rather than fd only.

tlslite_server: remove not-ready-yet next_protocol support