Refactored todo to use the argparse library
Added some doc strings to provide a little better commenting
Made method _-prefixed to denote "protected"
Removed extension, changed default file name
Added help messages for todos
Moving name back, so that tests can run
Refactored some code, fixed broken tests
Sorting functions by name in the TodoList class
Adding some docstrings and comments
Refactored complete to use new find method
Added messages for successful adds and completes
Added messages for successful moves