修改MongoClient的puma-admin名字为‘puma’
Merge pull request #7 from atellwu/develop

修改MongoClient的puma-admin名字为‘puma’
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
重构：Action改为Task， State并入Task对象
Merge pull request #8 from atellwu/develop

重构：Action改为Task， State并入Task对象
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
add task framework