xmemcached 2.0.0

Release note

• Performance tweaks,10% improved for text protocol in my benchmark.
• Fixed getStats could not work with cache dump,thanks to machao9email.
• Fixed deak lock when shutdown client.
• Fixed missing unsigned conversion on ONE_AT_A_TIME hash, thanks to spudone.
• Cached decoded object for the same key in a batch get,reduce CPU consumption.
• Used System.nanoTime instead of System.currentTimeInMills to generate namespace timestamp.

Maven dependency

 <dependency>
      <groupId>com.googlecode.xmemcached</groupId>
      <artifactId>xmemcached</artifactId>
      <version>2.0.0</version>
 </dependency>