Python3 config and plugins

A bit more refactoring
setup.py and newsctl executable. (This invalidates the old python news.py method.)
dos2unix to convert all filenames to valid Linux files without breaking imports
Removed warning and updated readme
Plugin system so it is easier to add a news source, see plugin_registration for example of adding sites
config.yaml is now read from and saved to a more reasonable location depending on operating system
configuration is handled better and config.yaml is created automatically if it doesn't exist

Griffintaur / News-At-Command-Line