Refactor command initialization
ensure 'add' command properly exits when a todo.txt structure is not well defined or set
Fix typos
Fix a problem with expansion of bash variables
fix typos
Don't export variable 'settings' and 'env' as public
Added copyrights, improved README
Package utils has been split into separate files and documentation has been improved with better func descriptions and examples
Added methods PaddingLeft and PaddingRight
Various improvements for help topics.

The cli app uses custom templates for the rendering of all the help
sections to support environment variables.
Print the name of the app in the command help section to avoid confusion
First draft of the todo.txt package.

This library provides a Reader and Writer compliant with the Todo.txt
Format, plus several other utilties for working the Todo.txt files.