Add tests for conditional gets
Add tests for conditional gets

Fixes #72.

Signed-off-by: Andrew Gaul <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@gaul.org>

robbat2/s3-tests,jmunhoz/s3-tests,jmunhoz/s3-tests,timuralp/s3-tests,timuralp/s3-tests,robbat2/s3-tests,andrewgaul/s3-tests,ceph/s3-tests,ceph/s3-tests,andrewgaul/s3-tests