1.1.0

Changes:

1. Update Trove Classifiers (from Pre-Alpha to Production/Stable)
2. Create CODE_OF_CONDUCT.md and CONTRIBUTING.md
3. Add issue templates
4. Save one line in cli.py
5. Fix exception of wait time is invalid (less than 0)
6. Add fallback if wall command doesn't exist (print message using python)
7. Make oom-notifier high priority if root
8. Add more info, links and badges to README.md
9. Add more info and links to CONTRIBUTING.md