A few changes to the original code

[AnakinFoxe]

First of all, thanks for this great script. It helped me download all the albums for my kid 😆

Made a few changes to the original code:

• Authenticate with password (with -p PASSWORD option), however if session ID is provided, password will be ignored.
• Add an option --folder to download all the albums under the specific folder
• Concurrently download images of the same album
• A few useful refactors (I think)
  • Split codes into functions and organize under class SmugMugDownloader
  • Use one session for all the requests
  • Use logging
  • Use @retry to manage retry for get_json()
  • Use Makefile to setup a virtual environment to work with

[andyjsmith]

Sorry for the late reply, I appreciate the changes!

I'm a bit hesitant on the password authentication due to some unhandled edge cases (e.g. what if the user has 2FA enabled?). Maybe we could keep both the user/pass and session token auth mechanisms instead of replacing it. As for the Makefile, I would like to keep this script platform-independent so I don't want to merge in a Unix-specific script. At some point a setup.py / pyproject.toml may be appropriate.

The other contributions are great but they probably need to be split off as separate PRs.

[jason-fer]

This repo is a lifesaver. Good point on allowing 2 separate modes Andy.

[AnakinFoxe]

@andyjsmith thanks for the comments! I have updated the PR with following changes (updated the PR description as well)

• Kept the -s SESSION argument. If session ID is provided, password will be ignored.
• Removed Makefile
• README.md has been updated accordingly.