add some more
update computenode interface
add stuff from meeting
Merge branch 'master' of https://github.com/ruw/Distributed-Systems-Projects into wentaol

Conflicts:
	MapReduce/src/dfs/client/DFSClientInputStream.java
	MapReduce/src/mapreduce/Mapper.java
	MapReduce/src/mapreduce/Reducer.java