Add command line and add option for convert mac (lf only)

[lukeapage]

Hi,

I added these for my own purposes and thought I would create a pull request to see if your interested. If not, no problem.

[JamesMGreene]

I thought about doing mac2unix/mac2dos/unix2mac/dos2mac when I was initially implementing this module but it had already taken me about 3 times as long as I had anticipated to do just the dos2unix/unix2dos -- especially since I completely rewrote it to be a more performant but less modular (and event-driven) as soon as I released it.

I'll evaluate this more when I get a chance. Thanks for contributing!