Transform yaml_server into yamlreader:
* Remove everything to leave only the code from the YamlReader class
* Turn class into plain function
* Be flexible about our argument, can be list/tuple, dir, file or glob
* Expand tests for new argument flexibility
* Add more debugging info
* Add CLI script
* Add command line options and parsing
* Add some CLI error handling
* Adjust packaging and build scripts
Git Ignore egg-info stuff