v4 .form-group lacks clearfix to work properly as grid row

Created by: marvin1023

<div class="form-group">
    <label class="col-sm-2 control-label">Email</label>
    <div class="col-sm-10">
      <p class="form-control-static">email@example.com</p>
    </div>
</div>

.col-sm-2 and .col-sm-10 has float, but .form-group has no clearfix