add the xlogAppenderptr in the xlog_appender.h
xlog系统2.0版开发完毕，初步测试通过。1.增加了向HDFS错误数据同步机制；2.写HDFS时由原来的每个category一个队列改为固定队列，通过hash将category散列到对应的队列中。
修改SimpleDateFormat非线程安全导致生成文件名并发错误的bug
add hadoop-1.0.3 dependency config
修改dispatcher连接断掉后导致代理节点进程退出的bug
modify the xlog log4j appender to batch send message
add the property maxSendSize of the xlogappender
add the the xlog logger alpha version.
add the xlog logger server in the dispatcher project
modify the xlog logger client classes
the xlog pub/sub beta release
代理节点添加压缩传输功能
move to the pub/sub directory
fix throw array out of range exception
1. add the  logback appender for xlog client(LogBackAppender),
2. add the gyp function for the c++/c project & remove the Makefile files
3. add the xlog pub/sub (pull & push method ) alpha version (notice: not stable)
4. add the rsyslog module for the xlog client
5. add the stdin module for the xlog client, which can read from the stdin stream
6. some small bug fixes
将protobuf的java依赖版本改为2.2.0
add the compress parameter for the xlog client
xlog.conf.example modified to the default values
return the send value
add the mutex in the xlog_appender and modify the dipacther_config police