fix small bugs of structuring in formatter.
Merge pull request #4 from algas/json-issue

fix small bugs of structuring in formatter.
v0.3.2
setup tox.
Merge pull request #5 from yyuu/support-tox

setup tox
support python 3.x
Merge pull request #6 from yyuu/python3

support python 3.x, and not support python 2.5 anymore.
v0.3.3
fixed broken link at README.md
s/fluent/fluentd/ in README.md