Displays the "save folder" dialog and returns the selected path name.

	// Opens a directory selection dialog for saving PNG files
	// and saves all selected textures to the file.
	import System.IO;
	@MenuItem("Examples/Save Textures to directory")
	static function Apply () {
		var textures = Selection.GetFiltered( Texture2D, SelectionMode.Unfiltered);
		if (textures.Length == 0) {
			EditorUtility.DisplayDialog("Select Textures",
						    "The selection must contain at least one texture!", "Ok");
			return;
		}
		var path = EditorUtility.SaveFolderPanel("Save textures to directory", "", "");
		if (path.Length != 0) {
			for( var texture : Texture2D in textures) {
				// Convert the texture to a format compatible with EncodeToPNG
				if (texture.format != TextureFormat.ARGB32 && texture.format != TextureFormat.RGB24) {
					var newTexture = Texture2D(texture.width, texture.height);
					newTexture.SetPixels(texture.GetPixels(0),0);
					texture = newTexture;
				}
				var pngData = texture.EncodeToPNG();
				if (pngData != null )
					File.WriteAllBytes(path + "/" + texture.name + ".png", pngData);
				else
					Debug.Log("Could not convert " + texture.name + " to png. Skipping saving texture");
			}
		}
	}