Fasteners

- Fix a failure to parse README as utf-8 on python2

- Fix a failure to parse README as utf-8

- Move from travis and appveyor to github actions
- Add interprocess reader writer lock
- Improve README
- remove unused eventlet import
- use stdlib monotonic instead of external for python >= 3.4

- Add testing for additional python versions
- Remove python 2.6 support
- Remove eventlet dependency and use
threading.current_thread instead

- Allow providing a custom exception logger to 'locked' decorator
- Allow providing a custom logger to process lock class
- Fix issue 12