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/AbstractMedia.java

@@ -235,9 +235,7 @@ public abstract class AbstractMedia
         }
     }
 
-    /**
-     * Dumps this media to a String object.
-     */
+    @Override
     public String toString ()
     {
         StringBuilder buf = new StringBuilder();