Support stdin
Closes #46

Add a TRY to the bunch of items that use handleChildren as a "callback" for
lack of a better word in my sleep-deprived condition.
Bump version in preparation for the next release
Possible fix for part of #35
Update pep8.py to be far closer to upstream.

I also modified the hash-bang in flake8/flake8 and fixed check_code in
flake8/run.py
Forgot to pull first. D'oh
Release 1.7.0
Forgot to add the Changes for 1.7.0

Closes #50