Adding startActivity method to CordovaInterface as many plugins rely on this method

framework/src/org/apache/cordova/api/CordovaInterface.java

@@ -69,6 +69,13 @@ public interface CordovaInterface {
      */
     abstract public void startActivityForResult(IPlugin command, Intent intent, int requestCode);
 
+    /**
+     * Launch an activity for which you would not like a result when it finished. 
+     *  
+     * @param intent            The intent to start
+     */
+    abstract public void startActivity(Intent intent);
+    
     /**
      * Set the plugin to be called when a sub-activity exits.
      *