fix setup.py in python2.7

update version: 0.42

update version in __init__.py

Update Changelog

version change 0.39

Merge pull request fxsjy#247 from gumblex/master

更新文档

Update README.md

Update __init__.py

fix a bug. use sys.version_info.major can't be used in Python2.5

tag version 0.29.1