Rename MapReader&Writer
Merge remote-tracking branch 'origin/master'

Conflicts:
	MapReduceFramework/src/TestJob.java
	MapReduceFramework/src/lxu/lxdfs/datanode/BlockService.java
	MapReduceFramework/src/lxu/lxdfs/namenode/NameNode.java
	MapReduceFramework/src/lxu/lxmapreduce/io/MapReader.java
	MapReduceFramework/src/lxu/lxmapreduce/io/MapWriter.java
	MapReduceFramework/src/lxu/lxmapreduce/io/RecordReader.java
	MapReduceFramework/src/lxu/lxmapreduce/io/RecordWriter.java
	MapReduceFramework/src/lxu/lxmapreduce/io/ReduceReader.java
	MapReduceFramework/src/lxu/lxmapreduce/io/ReduceWriter.java
	MapReduceFramework/src/lxu/lxmapreduce/io/format/TextInputFormat.java
	MapReduceFramework/src/lxu/lxmapreduce/io/format/TextOutputFormat.java
	MapReduceFramework/src/lxu/lxmapreduce/job/IJobTracker.java
	MapReduceFramework/src/lxu/lxmapreduce/job/JobInProgress.java
	MapReduceFramework/src/lxu/lxmapreduce/job/JobTracker.java
	MapReduceFramework/src/lxu/lxmapreduce/task/TaskInputOutputContext.java
	MapReduceFramework/src/lxu/lxmapreduce/task/TaskTracker.java
	MapReduceFramework/src/lxu/lxmapreduce/task/map/MapContext.java
	MapReduceFramework/src/lxu/lxmapreduce/task/map/MapTask.java
	MapReduceFramework/src/lxu/lxmapreduce/task/map/Mapper.java
	MapReduceFramework/src/lxu/lxmapreduce/task/reduce/ReduceContext.java
	MapReduceFramework/src/lxu/lxmapreduce/task/reduce/Reducer.java
Put reduce output into dfs