Flesh out introduction and use cases a bit more
Flesh out introduction and use cases a bit more

Change-Id: Ife12e3124d465c4d9ffd1edd12c7b82ea6260dc0
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/7886
Reviewed-by: Michael Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@cloudera.com>
Tested-by: Michael Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@cloudera.com>

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