demo/amd/rjs/output/unified/marionette-build.js
function() {
      var regions = this.getRegions();
      _.each(this._regions, function(region, name) {
        this._remove(name, region);
      }, this);
  
      return regions;
    }
function() {
      var regions = this.getRegions();
      _.each(this._regions, function(region, name) {
        this._remove(name, region);
      }, this);
  
      return regions;
    }
Empty all regions in the region manager, and remove them