Merge branch 'master' of https://github.com/jsk-ros-pkg/jsk_common
Merge branch 'master' of https://github.com/jsk-ros-pkg/jsk_common
Merge branch 'master' of https://github.com/jsk-ros-pkg/jsk_common
Merge branch 'master' of https://github.com/jsk-ros-pkg/jsk_common
Reuse isMasterAlive function across scripts which
want to check master state
Merge pull request #638 from garaemon/reuse-is-master-alive-function

Reuse isMasterAlive function across scripts to check master's life