Make help output shell specific
Fix several English errors
Fix template documentation
Support 'interative' type in MAGPIE_JOB_TYPE
Fix scripting corner case with quotes
Add new script bin/magpie-zookeper.sh to start/stop Zookeeper across
all nodes.

Script is similar to Hadoop start-dfs.sh or Hbase's start-hbase.sh
and is intended for easier Zookeeper setup/shutdown.