refactor
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
add task framework
Merge branch 'develop_branch2' of https://github.com/dianping/puma into develop_branch2
Merge pull request #10 from leoliang/develop_branch2

增加task framework，但是还没有完善