add .gitignore File to Repo?

[raymond301]

Would you be willing to add a .gitignore file to this repo, so when we fork or clone the repository, we don't have to pull down all the data files?

*.tsv
*.tsv.gz
*.tbi

It my be better to host the data files, that result from this code somewhere else, for those users who just want the pre-canned results.

[raymond301]

Thanks for clearing up the data files from the code repo.

[bw2]

I actually want to add the data back once PR
#24
gets merged later today.
Let me create another issue to discuss pros/cons of a data-only repo.