Adding file (src/make_CRAB_configuration.py) and scripts (src/make_ntuples_CRAB_configurations.sh, src/make_unfolding_CRAB_configurations.sh) to make CRAB configuration files for ntuplising and unfolding.

Also adding src/check_CRAB_jobs.py to check which CRAB jobs of a submission are not finished yet.
Merge pull request #13 from jjacob/master

Python files, shell scripts for making our CRAB configuration files (i never made the recommended corrections/improvements  from my original pull request in December (#1), so here it is).