Specify content-type json for PUT/POST requests
Add copperegg-cli script for setup.py
Add copperegg-cli, a command-line interface to the CopperEgg API utilizing the Python CopperEgg API wrapper.

Current functionality includes viewing and editing existing probes:
- Find by probe id and tags.
- Edit check interval (frequency), stations.
- Enable/disable probes.
- Logging to file and printing on stdout with adjustable verbosity or disabling printing on stdout entirely.
Add documentation in the readme for copperegg-cli