Merge pull request #7 from xiaoyunwu/master

initial tree topology
Merge pull request #9 from xiaoyunwu/master

fix minor compile error
fix test tree topo
add travis ci
Merge pull request #11 from go-distributed/travis

add travis ci
Merge pull request #10 from go-distributed/test

fix test tree topo
Skip TestBootStrap
Merge pull request #12 from fengjingchao/master

Skip TestBootStrap
Merge pull request #13 from xiaoyunwu/master

refine the task
fix travis in readme