CLI that prints version info with -v

added the beginnings of a cli, for now it just can print version information

From what I could tell, this is really all that was needed for the issue that was related to this
[https://github.com/PolicyStat/psychic-octo-robot/issues/2]

I was thinking that there should be tests to check that this works, but there is little actual *work* being done, so not much that is testable, just printing out stuff I get from function calls really.
If there is more that should be done, or if anything else is needed, just let me know, but I think this is done.

I used commander.js to make the option parsing nice, they use an MIT license so license stuff should be fine.