fix namespace not found error with some IDE's

src/citrus/core/CitrusEngine.as

@@ -18,6 +18,8 @@ package citrus.core {
 	import flash.geom.Matrix;
 	import flash.media.SoundMixer;
 
+	use namespace citrus_internal;
+
 	/**
 	 * CitrusEngine is the top-most class in the library. When you start your project, you should make your
 	 * document class extend this class unless you use Starling. In this case extends StarlingCitrusEngine.
@@ -27,8 +29,6 @@ package citrus.core {
 	 */	
 	public class CitrusEngine extends MovieClip
 	{
-		use namespace citrus_internal;
-
 		public static const VERSION:String = "3.2.0";
 
 		private static var _instance:CitrusEngine;

src/citrus/core/starling/StarlingCitrusEngine.as

@@ -12,6 +12,8 @@ package citrus.core.starling {
 	import flash.display.Stage3D;
 	import flash.events.Event;
 	import flash.geom.Rectangle;
+
+	use namespace citrus_internal;
 
 	/**
 	 * Extends this class if you create a Starling based game. Don't forget to call <code>setUpStarling</code> function.
@@ -20,8 +22,6 @@ package citrus.core.starling {
 	 */
 	public class StarlingCitrusEngine extends CitrusEngine {
 
-		use namespace citrus_internal;
-
 		public var textureScaleFactor:Number = 1;
 
 		protected var _debug:Boolean = false;