Basic (crude) log level support
Removing `log` from top-level package.

This is the same way Requests does logging, which I think is a good example.
Removing unneeded import
Merge branch 'feature/s3-redis-integration' into feature/basic-loglevel-support

Conflicts:
	src/zinc/cli.py
Merge branch 'feature/s3-redis-integration' into feature/basic-loglevel-support
Merge branch 'feature/s3-redis-integration' into feature/basic-loglevel-support

Conflicts:
	src/zinc/tasks/bundle_clone.py
Merge pull request #15 from mindsnacks/feature/basic-loglevel-support

Basic (crude) log level support