Upstream changes:
0.9.2 (2015-06-17):
- Fix a traceback when a global is defined in one scope, and used in another.
0.9.1 (2015-06-09):
- Update NEWS.txt to include 0.9.0, which had been forgotten.
0.9.0 (2015-05-31):
- 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.
- Report an error for 'return' outside a function.
fbcabd09bf