Fixes ArrayIndexOutOfBoundsException while sending big objects from Java...

Hi Simon,

Here's the fix to the ArrayIndexOutOfBoundsException. It seems to me that the 31 MB string was correctly serialized since R was able to parse it and the summary seems reasonable. I'm not sure if similar things wouldn't need to be done on the native Rserve side and/or in Java if R were to send large payloads back to Java. Let me know. 

Thanks!

Marek