Add a Facets.keyParser setting, which allows for the label to be set

when a new item is set.

This is meant to be used against the key, and not be dynamically
updated.

@@ -216,6 +216,9 @@ define(function(require) {
             this.facetField = options.facetField;
             this.facetField = options.facetField;
             this.queryField = options.queryField;
             this.queryField = options.queryField;
             this.queryValue = options.queryValue;
             this.queryValue = options.queryValue;
+            if (options.keyParser) {
+                this.keyParser = options.keyParser;
+            }
             this.bins = options.bins;
             this.bins = options.bins;
             switch (this.facetType) {
             switch (this.facetType) {
                 case 'year':
                 case 'year':
@@ -239,6 +242,9 @@ define(function(require) {
             }
             }
             return Facet.__super__.initialize.apply(this, arguments);
             return Facet.__super__.initialize.apply(this, arguments);
         },
         },
+        keyParser: function(key) {
+            return {key: key, label: key};
+        },
         resetSearch: function(options) {
         resetSearch: function(options) {
             this.get('items').invoke('reset', null, options);
             this.get('items').invoke('reset', null, options);
         },
         },
@@ -347,10 +353,14 @@ define(function(require) {
         },
         },
         getOrCreateItem: function addOrGetItem(key) {
         getOrCreateItem: function addOrGetItem(key) {
             var items = this.get('items');
             var items = this.get('items');
-            key = Facet.Item.checkNull(key);
+            var keyInfo = this.keyParser(Facet.Item.checkNull(key));
+            key = keyInfo.key;
+            var label = keyInfo.label;
             var item = items.get(key);
             var item = items.get(key);
             if (!item) {
             if (!item) {
-                item = new Facet.Item({key: key, value: 0});
+                item = new Facet.Item({key: key, label: label, value: 0});
+            } else if (label !== undefined) {
+                item.set('label', label);
             }
             }
             return item;
             return item;
         },
         },