minor version
Update Changelog
Update README.md
update test case
Merge branch 'master' of https://github.com/fxsjy/jieba
使用更明确的表达
Merge pull request #45 from cloudaice/cloudaice-dev

使用更明确的表达
Merge pull request #1 from fxsjy/master

使用更明确的表达
Merge pull request #2 from fxsjy/master

使用更明确的表达
Catch明确的错误
Merge pull request #46 from cloudaice/cloudaice-dev

明确声明处理的异常
Merge pull request #3 from fxsjy/master

捕获明确的错误
Merge pull request #4 from fxsjy/master

sync code
修改demo.py的代码格式，使得符合pep8规范
规范readme的示例代码
将tab换成空格，使用is判断对象是否为None
替换tab为空格，使用join代替循环
添加cut,set_dictionary,cut_for_search三个测试用例
添加cutall 测试用例
add jieba.posseg test case