Provide default of None for range_key.
Use spot instances by default when running a mortar job.
added useful testing for s3 transfer
refactor file to target
added handling for s3 tasks
Add SanityTest task for Mongo
Add test dependencies so they get installed.
Separate test dependencies back out
Run tests through setup so that test dependencies are used.
Merge pull request #14 from mortardata/jkarn_mongo_luigi

[#67986970] Add SanityTest task for Mongo
added shellscript tasks
Merge branch 'master' of https://github.com/mortardata/mortar-luigi into cngan_s3_db
fixed unit testing for s3 transfers