title: ng-table grouping - initialize with rows minimised
body: <p>I am using the grouping example of ng-table from <a href="http://plnkr.co/edit/CBcbkc" rel="noreferrer">http://plnkr.co/edit/CBcbkc</a></p>
  
  <p>Right now the table is initialised with rows expanded, but I would like them to be minimised as I have over 100 records. How can I do this?</p>