WebWorks alignment and update for Countly Cloud

- Changed _os metric value from BB10 to BlackBerry to align it with
WebWorks SDK
- Added a note to README for Countly Cloud users

README.md

@@ -41,6 +41,8 @@
 	</li>
 </ol>
 
+**Note:** If you use Countly Cloud, you should set your host to https://cloud.count.ly in step 2.
+
 <h2>PERSISTENCE</h2>
 <p>
 	By default, events are persisted to a sqlite database that the SDK will create in your app's data folder. Any events that are not successfully delivered, are persisted to this database, and the application will attempt to deliver them on the next execution.

sdk/src/CountlyMetrics.cpp

@@ -39,7 +39,7 @@ CountlyMetrics::CountlyMetrics() {
 	 */
 	// OS and OS_VERSION
 	PlatformInfo platform;
-	insert("_os", "BB10");
+	insert("_os", "BlackBerry");
 	insert("_os_version", platform.osVersion());
 
 	// DEVICE