[code-quality] Pyflakes 0.9.0 released

[Phil Frost]

I'm happy to announce the release of Pyflakes 0.9.0. The release is
available on PyPI:

https://pypi.python.org/pypi/pyflakes

and the code is available on GitHub:

https://github.com/pyflakes/pyflakes/releases/tag/0.9.0

Bugfixes:

- Exit gracefully, not with a traceback, on SIGINT and SIGPIPE.
- Fix incorrect report of undefined name when using lambda expressions
in generator expressions
- Don't crash on DOS line endings on Windows and Python 2.6
- Don't report an undefined name if the 'del' which caused a name to
become undefined is only conditionally executed
- Properly handle differences in list comprehension scope in Python 3
- Improve handling of edge cases around 'global' defined variables

New Features:

- Report an error for 'return' outside a function

I'd like to thank all the people who contributed to this release:

- Aaron Meurer
- Adi Roiban
- Charles-Francois Natali
- Florent Xicluna
- Ian Cordasco
- Jan Stürtz
- ryneeverett
- Steven Myint