Added override and clear methods to event class.

Signed-off-by: Taylor Otwell <taylorotwell@gmail.com>

laravel/event.php

@@ -40,6 +40,31 @@ public static function listen($event, $callback)
 		static::$events[$event][] = $callback;
 	}
 
+	/**
+	 * Override all callbacks for a given event with a new callback.
+	 *
+	 * @param  string  $event
+	 * @param  mixed   $callback
+	 * @return void
+	 */
+	public static function override($event, $callback)
+	{
+		static::clear($event);
+
+		static::listen($event, $callback);
+	}
+
+	/**
+	 * Clear all event listeners for a given event.
+	 *
+	 * @param  string  $event
+	 * @return void
+	 */
+	public static function clear($event)
+	{
+		static::$events[$event] = array();
+	}
+
 	/**
 	 * Fire an event and return the first response.
 	 *