Diff to remove the need of sorting the list before calls

Evenement1.diff

diff --git a/src/Evenement/EventEmitter.php b/src/Evenement/EventEmitter.php
index 5b8d00c..8207aaf 100644
--- a/src/Evenement/EventEmitter.php
+++ b/src/Evenement/EventEmitter.php
@@ -29,21 +29,16 @@ namespace Evenement;
 class EventEmitter
 {
 	private $listeners = array();
-	private $modified = array();
 
 	public function on($event, $listener)
 	{
 		if (!is_callable($listener)) {
 			throw new \InvalidArgumentException('The provided listener was not a valid callable.');
 		}
-
-		if (!isset($this->listeners[$event])) {
-			$this->listeners[$event] = array();
-		}
-
+		
+		empty($this->listeners[$event]) && $this->listeners[$event] = array();
+		
 		$this->listeners[$event][] = $listener;
-
-		$this->modified[$event] = true;
 	}
 
 	public function removeListener($event, $listener)
@@ -62,27 +57,18 @@ class EventEmitter
 
 	public function listeners($event)
 	{
-		if (!isset($this->listeners[$event])) {
-			return array();
-		}
-
-		$this->sortListenersEventIfModified($event);
-
-		return $this->listeners[$event];
+		return empty($this->listeners[$event]) ? array() : $this->listeners[$event];
 	}
 
 	public function emit($event, array $arguments = array())
 	{
-		foreach ($this->listeners($event) as $listener) {
-			call_user_func_array($listener, $arguments);
+		if(empty($this->listeners[$event]))
+		{
+			return;
 		}
-	}
-
-	private function sortListenersEventIfModified($event)
-	{
-		if ($this->modified[$event]) {
-			krsort($this->listeners[$event]);
-			unset($this->modified[$event]);
+		
+		foreach ($this->listeners[$event] as $listener) {
+			call_user_func_array($listener, $arguments);
 		}
 	}
 }