modify ActionThread.java to solve the lock problem.
    modified WALDetection.java to solve the performance problem by deleting get old value code.
    modified the conf/hbase-env.sh to solve the out of heap size exception.
    modified the HelloWorld.java to suit the PerformanceEvaluation program's table name and column name.
    AND this version is tested and can be run is distributed environment correctly.
Merge remote-tracking branch 'origin/master'