Update to 15.3.0:

Twisted Core 15.3.0 (2015-08-04)
================================

Features
--------
- twisted.application.app is now ported to Python 3 (#6914)
- twisted.plugin now supports Python 3 (#7182)
- twisted.cred.checkers is now ported to Python 3. (#7834)
- twisted.internet.unix is now ported to Python 3. (#7874)
- twisted.python.sendmsg has now been ported to Python 3, using the
  stdlib sendmsg/recvmsg functionality when available. (#7884)
- twisted.internet.protocol.Factory now uses the new logging system
  (twisted.logger) for all its logging statements. (#7897)
- twisted.internet.stdio is now ported to Python 3. (#7899)
- The isDocker method has been introduced on
  twisted.python.runtime.Platform to detect if the running Python is
  inside a Docker container. Additionally, Platform.supportsINotify()
  now returns False if isDocker() is True, because of many Docker
  storage layers having broken INotify. (#7968)

Bugfixes
--------
- twisted.logger.LogBeginner.beginLoggingTo now outputs the correct
  warning when it is called more than once. (#7916)

Deprecations and Removals
-------------------------
- twisted.cred.pamauth (providing PAM support) has been removed due
  to it being unusable in current supported Python versions. (#3728)
- twisted.application.app.HotshotRunner (twistd's hotshot profiler
  module) is removed and twistd now uses cProfile by default. (#5137)
- twisted.python.win32.getProgramsMenuPath and
  twisted.python.win32.getProgramFilesPath are now deprecated.
  (#7883)
- twisted.lore has now been removed, in preference to Sphinx. (#7892)
- Deprecated zsh tab-complete files are now removed in preference to
  twisted.python.usage's tab-complete functionality. (#7898)
- twisted.python.hashlib, deprecated since 13.1, has now been
  removed. (#7905)
- twisted.trial.runner.DryRunVisitor, deprecated in Twisted 13.0, has
  now been removed. (#7919)
- twisted.trial.util.getPythonContainers, deprecated since Twisted
  12.3, is now removed. (#7920)
- Twisted no longer supports being packaged as subprojects. (#7964)

Other
-----
- #6136, #7035, #7803, #7817, #7827, #7844, #7876, #7906, #7908,
  #7915, #7931, #7940, #7967, #7983

Twisted Conch 15.3.0 (2015-08-04)
=================================

Bugfixes
--------
- The Conch Unix server now sets the HOME environment variable when
  executing commands. (#7936)

Other
-----
- #7937

Twisted Web 15.3.0 (2015-08-04)
===============================

Features
--------
- twisted.web.xmlrpc is now ported to Python 3. (#7795)
- twisted.web.template and twisted.web.util are now ported to Python
  3. (#7811)
- twisted.web.error is now ported to Python 3. (#7845)

Deprecations and Removals
-------------------------
- twisted.web.html is now deprecated in favor of
  twisted.web.template. (#4948)

Other
-----
- #7895, #7942, #7949, #7952, #7975

(wiz)