Remove use of curly braces

Author: Kogis IWI

Source/Scene/UrlTemplateImageryProvider.js

@@ -160,9 +160,9 @@ define([
      * });
      * // Using custom tags in your template url.
      * var custom = new Cesium.UrlTemplateImageryProvider({
-     *    url : 'https://yoururl/{time}/{z}/{y}/{x}.png',
+     *    url : 'https://yoururl/{Time}/{z}/{y}/{x}.png',
      *    customTags : {
-     *        '{time}': function(imageryProvider, x, y , level) {
+     *        Time: function(imageryProvider, x, y , level) {
      *            return '20171231'
      *        }
      *    }
@@ -578,11 +578,12 @@ define([
             }
             that._credit = credit;
 
-            if (properties.customTags) {
+            if (defined(properties.customTags)) {
                 for (var tag in properties.customTags) {
                     if (properties.customTags.hasOwnProperty(tag)) {
-                        tags[tag] = properties.customTags[tag]; //eslint-disable-line no-use-before-define
-                        pickFeaturesTags[tag] = properties.customTags[tag]; //eslint-disable-line no-use-before-define
+                        var targetTag = '{' + tag + '}';
+                        tags[targetTag] = properties.customTags[tag];
+                        pickFeaturesTags[targetTag] = properties.customTags[tag];
                     }
                 }
             }

Specs/Scene/UrlTemplateImageryProviderSpec.js

@@ -640,14 +640,14 @@ defineSuite([
             tilingScheme: new GeographicTilingScheme(),
             maximumLevel: 6,
             customTags: {
-                '{custom1}': function() { return 'foo';},
-                '{custom2}': function() { return 'bar';}
+                custom1: function() { return 'foo';},
+                custom2: function() { return 'bar';}
             }
         });
 
         return pollToPromise(function() {
             return provider.ready;
-        }).then(function() {console.error('spyon');
+        }).then(function() {
             spyOn(loadImage, 'createImage').and.callFake(function(url, crossOrigin, deferred) {
                 expect(url).toEqual('made/up/tms/server/foo/bar/2/1/3.PNG');