Update CONTRIBUTING.md

Changed setup.py development status to 'stable'

Update README.md

Merge pull request #69 from emxsys/refactor-views

Refactored views and navigation

Refactored call screening and call logging

- Made consistant use of call logging arguments
_ Updated unit tests

Added screenshots

Merge branch 'master' of https://github.com/emxsys/callattendant

Merge branch 'master' of github.com:emxsys/callattendant