adding combine part
adding comine output
Fixed Join input bug.
Fixed join output in JobFlow
Removed SumScore.java (obsolete) and its test input file; Moved in/ml/headers to in/headers
Merge branch 'master' of https://github.com/liranoz12/dsp

* 'master' of https://github.com/liranoz12/dsp:
  adding comine output
  adding combine part
Added quoting for attributes in Headers