Merge pull request #12 from fengjingchao/master

Skip TestBootStrap
refine the task related interface, start DummyTask
refine the task related interface, start DummyTask
try to fix build
add more code to dummy_task
Merge pull request #13 from xiaoyunwu/master

refine the task
refactor TaskConfig to TaskBuilder
edit README.md so that it use TaskGraph as name
fix travis in readme
fix travis in readme
fix travis in readme
Merge pull request #14 from xiaoyunwu/master

refactor TaskConfig to TaskBuilder
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface
Add payload rpc interface