- Changes file cleanup

- Update to version 0.12
* Features
- The interface argument to IReactorTCP.listenTCP may now be an IPv6
address literal, allowing the creation of IPv6 TCP servers.
- twisted.python.constants.Names now provides a way to define
collections of named constants, similar to the "enum type" feature
of C or Java.
- twisted.python.constants.Values now provides a way to define
collections of named constants with arbitrary values.
* Bugfixes
- Fixed an obscure case where connectionLost wasn't called on the
protocol when using half-close.
- UDP ports handle socket errors better on Windows.
- When idle, the gtk2 and glib2 reactors no longer wake up 10 times a
second.
- Prevent a rare situation involving TLS transports, where a producer
may be erroneously left unpaused.
- twisted.internet.iocpreactor.iocpsupport now has fewer 64-bit
compile warnings.
- The GTK2 reactor is now more responsive on Windows.
- TLS transports now correctly handle producer registration after the
connection has been lost.
- twisted.protocols.htb.Bucket now empties properly with a non-zero
drip rate.
- IReactorSSL and ITCPTransport.startTLS now synchronously propagate
errors from the getContext method of context factories, instead of
being capturing them and logging them as unhandled.
* Improved Documentation