1. add feature to support Object keys(@see interface TransBytecode);2.fi...

Hi,
I feel limited when i found out that only String can be used as the key,so i changed it by Serializable Object.
Please check @see interface TransBytecode,@see testcase MemCachedBenchTcpKey,MemCachedBenchUdpKey and MemCachedBenchBinaryKey.