update to mesos version 0.20 by default to support docker
start mesos using init wrapper
updating playbook version
Merge pull request #12 from kienpham2000/mesos-0.20

update to mesos version 0.20 by default to support Docker -n@kienpham2000
Update mesos.j2

wrap cluster name around string to support space
make mesos ip easier to config from playbook
bump up playbook version
adding test and overwrite zk config file