[modify] update colorbox to 1.6.4

but this couldn't help for jquery migration warnings

public/assets/css/colorbox/colorbox.css

@@ -2,7 +2,7 @@
     Colorbox Core Style:
     The following CSS is consistent between example themes and should not be altered.
 */
-#colorbox, #cboxOverlay, #cboxWrapper{position:absolute; top:0; left:0; z-index:9999; overflow:hidden;}
+#colorbox, #cboxOverlay, #cboxWrapper{position:absolute; top:0; left:0; z-index:9999; overflow:hidden; -webkit-transform: translate3d(0,0,0);}
 #cboxWrapper {max-width:none;}
 #cboxOverlay{position:fixed; width:100%; height:100%;}
 #cboxMiddleLeft, #cboxBottomLeft{clear:left;}
@@ -20,7 +20,7 @@
     Change the following styles to modify the appearance of Colorbox.  They are
     ordered & tabbed in a way that represents the nesting of the generated HTML.
 */
-#cboxOverlay{background:url(images/overlay.png) repeat 0 0;}
+#cboxOverlay{background:url(images/overlay.png) repeat 0 0; opacity: 0.9; filter: alpha(opacity = 90);}
 #colorbox{outline:0;}
     #cboxTopLeft{width:21px; height:21px; background:url(images/controls.png) no-repeat -101px 0;}
     #cboxTopRight{width:21px; height:21px; background:url(images/controls.png) no-repeat -130px 0;}