Bootstrap rendered grid
A rendered grid with rows in Elm
Example usage
renderBootstrapGrid 3 [div [][], div [][], div [][]]
This function will return the following:
<div class="row">
<div class="col-md-4 col-sm-6 col-xs-12"></div>
<div class="col-md-4 col-sm-6 col-xs-12"></div>
<div class="col-md-4 col-sm-6 col-xs-12"></div>
</div>