updating README to address missing libmagic in darwin
Merge pull request #21 from georgejose/fix_readme

updating README to address missing libmagic in darwin
Update README.md
fix for dupliate output for each unique record
Merge pull request #27 from gsrika/master

fix for dupliate output for each unique record
adding useful commandline error msgs
Merge pull request #29 from georgejose/add-error-msgs

adding useful commandline error msgs
adding date format check