Merge pull request #1 from clockfly/master

sync from clockfly/gearpump
Merge pull request #2 from intel-hadoop/master

merge with intelhadoop/gearpump
sync with upstream
Merge pull request #1 from gearpump/master

sync
Merge pull request #5 from clockfly/master

sync
support basic shell commands
Merge branch 'master' of https://github.com/clockfly/gearpump
support shell commands
update help
fix help
update command shell
fix command help
fix shell
fix comments
Merge pull request #2 from gearpump/master

Merge pull request #5 from clockfly/master
Merge pull request #86 from clockfly/master

add basic shell support