dict.get(item) vs dict[item] fixes the KeyError when you have a custom formatter variable and a logger did not include it.
Merge pull request #9 from deanq/master

Fix the KeyError on formatter
Updated iteritems to items for python3 compatibility. #10
Pypi version bump
Source pypi version was behind. Closes #10
Merge https://github.com/madzak/python-json-logger

Conflicts:
	src/jsonlogger.py