Stubs for Mapper and Reducer class
class to read
and write config to/from file
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