Breaking change; fix global singleton issue around Facets.

@@ -4,6 +4,7 @@ define(function(require) {
     var Backbone = require('backbone');
 
     var Facets = require('solr/model/Facets');
+    var Facet = require('solr/model/Facet');
     var Ordering = require('solr/model/Ordering');
     var QueryTextField = require('solr/model/QueryTextField');
     var Util = require('solr/model/Util');
@@ -24,7 +25,11 @@ define(function(require) {
         defaults: function defaults() {
             var constructor = this.constructor;
             var formNameMap = {};
-            var facets = new Facets(this.constructor.facets, {search: this});
+            var constructorFacets = {};
+            _.each(this.constructor.facets, function(facetInfo, facetName) {
+                constructorFacets[facetName] = new Facet(facetInfo.data, facetInfo.options);
+            });
+            var facets = new Facets(constructorFacets, {search: this});
             _.each(facets.values(), function(facet) {
                 var formName = facet.get('formName');
                 if (formName) {