Fixed substring bug in Join.java
Added compile-and-run.sh script
Merge branch 'master' of https://github.com/liranoz12/dsp

* 'master' of https://github.com/liranoz12/dsp:
  starting Sum part
  deleting input files
Reverted accidentla deletion of ass2 testing in/ files.
Renamed Sum.java to SumScore.java
Added Join output file to in/
Finished SumScore.java