Implement error reporting level including returned status code

[stefanjudis]

I really like the project, as it could me improving me workflow by putting in comments in there during longtime development of a feature.

To make it really useful, it would be great to set reporting levels.

I'm thinking of the return of a status code 1 in case any TODO were discovered.
Or even a returned status code if anything is discovered.

This would allow me to put it into a CI system or use it inside of a git hook to not accidentally commit any TODO comments.

[ahmadassaf]

@stefanjudis i have just published a similar npm module that will fix your issue above on https://github.com/ahmadassaf/code-notes .. i hope you find it useful