code: public Query addRangeRefinement(String navigationName, String low, String high) {
      return addRangeRefinement(navigationName, low, high, false);
    }
docs: <code>
  Add a range refinement.  Takes a refinement name, a lower and upper bounds.
  </code>
  
  @param navigationName
  The name of the refinement
  @param low
  The low value
  @param high
  The high value