Pretty print the output file
Allow todos with spaces to be created correctly, fixes #8
Merge pull request #7 from mikespokefire/feature/pretty-print-save-file

Pretty print the output file
Merge pull request #9 from mikespokefire/hotfix/add-todos-with-spaces

Allow todos with spaces to be created correctly, fixes #8
Exit with non zero exit code for bad commands
Merge pull request #10 from mikespokefire/feature/exit-with-non-zero-exit-code-for-bad-commands

Exit with non zero exit code for bad commands
Allow todos to be marked as complete or incomplete