bin/get-amy.py: proper argparsing, args for tag filtering
bin/get-amy.py: proper argparsing, args for tag filtering

1. Add proper solution for argument parsing (argparse module from
Python).
2. Add '-t'/'--tag' arguments for specifying tags used in event
filtering.
3. Filter events (via query) by tags provided.

k8hertweck/website,gvwilson/website,JasonJWilliamsNY/website,JasonJWilliamsNY/website,gvwilson/website,pbanaszkiewicz/website,swcarpentry/website,rgaiacs/swc-website,k8hertweck/website,JasonJWilliamsNY/website,JasonJWilliamsNY/website,JasonJWilliamsNY/website,k8hertweck/website,gvwilson/website,ErinBecker/website,rgaiacs/swc-website,pbanaszkiewicz/website,ErinBecker/website,ErinBecker/website,swcarpentry/website,gvwilson/website,k8hertweck/website,swcarpentry/website,pbanaszkiewicz/website,ErinBecker/website,ErinBecker/website,swcarpentry/website,swcarpentry/website,rgaiacs/swc-website,k8hertweck/website,pbanaszkiewicz/website,rgaiacs/swc-website,gvwilson/website,rgaiacs/swc-website,pbanaszkiewicz/website