save instead of insert to overwrite old value
dont ignore query when doing calculate_single_split
allow for max and min bounds early on before splitting in calculate_unsharded_splits
Update README.md
Remove None from .get() since its default
allows to configure what to do in add(). add_action(defaults) to insert can be one of insert, save or update. set add_upsert to True to upsert when updating
Merge pull request #3 from sajal/master

Use save not insert when storing output
Merge branch 'master' of github.com:10genNYUITP/MongoDisco