Cancel outstanding tasks and shut down the executor.

api/net/sf/briar/api/plugins/PluginManager.java

@@ -6,10 +6,10 @@ public interface PluginManager {
 	 * Starts the plugins and returns the number of plugins successfully
 	 * started.
 	 */
-	int startPlugins();
+	int start();
 
 	/**
 	 * Stops the plugins and returns the number of plugins successfully stopped.
 	 */
-	int stopPlugins();
+	int stop();
 }