Add "instances" array + test

browser-sync/browser-sync-tests.ts

@@ -78,6 +78,8 @@ evt.on("init", function () {
 
 browserSync(config);
 
+var instance = browserSync.instances[0];
+
 var bs = browserSync.create();
 
 bs.init({

browser-sync/browser-sync.d.ts

@@ -328,6 +328,8 @@ declare module "browser-sync" {
              * @param name the identifier used for retrieval
              */
             get(name: string): BrowserSyncInstance;
+
+            instances: BrowserSyncInstance[];
         }
 
         interface BrowserSyncInstance {