Use the configuration file with the 'put' and 'get' commands

[alpegon]

Allow the user to use the configuration file with both commands would simplify the CLI. The CLI command rith now to upload a file is:

scar put -b scar-darknet-bucket -bf scar-darknet-s3/input -p dog.jpg

after the change it would be:

scar put -f scar-darknet.yaml -p dog.jpg