Add in @Overrides across the board, clean up the comments around them some, and remove

unneeded imports.
I've got partially completed patches for narya & vilya, too, but nenya was the 
only one that wound up in a decent state after a friday evening puttering at it,
killing time waiting on other things to finish.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@572 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/sprite/SpriteManager.java

@@ -33,7 +33,6 @@ import com.samskivert.util.SortableArrayList;
 
 import com.threerings.media.AbstractMedia;
 import com.threerings.media.AbstractMediaManager;
-import com.threerings.media.MediaHost;
 
 /**
  * The sprite manager manages the sprites running about in the game.
@@ -247,7 +246,7 @@ public class SpriteManager extends AbstractMediaManager
 //        }
 //    }
 
-    @Override // from AbstractMediaManager
+    @Override
     protected SortableArrayList<? extends AbstractMedia> createMediaList ()
     {
         return (_sprites = new SortableArrayList<Sprite>());