Added readLong and writeLong to our streaming classes.

Use that in PongResponse.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5358 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/presents/net/PongResponse.as

@@ -56,10 +56,7 @@ public class PongResponse extends DownstreamMessage
         _unpackStamp = getTimer();
         super.readObject(ins);
 
-        // TODO: Figure out how we're really going to cope with longs
-        _packStamp = new Long();
-        ins.readBareObject(_packStamp);
-
+        _packStamp = ins.readLong();
         _processDelay = ins.readInt();
     }