Refactor

[jsmartt]

Fixes #6

This PR:

• Pushes the real work back onto the Knife modules
• Gets the data from the search directly, not through stdout
• Uses the standard knife UI module to output the data, meaning you can pass in the -F option, and the standard --color and --no-color options
• Lastly, added an option so that just like the search option, you can pass in -i (or --id-only) to print the IDs only.
• Updates/adds some README sections

@lnxchk , let me know if you're not willing to service this and release it; if not, I'd probably start from scratch with my own.

[lnxchk]

I'll take a look at this. I'm kind of surprised it's still being used. I thought most folks had just moved to "knife status".

[jsmartt]

lol. I didn't even notice the hide-by-mins option in knife status. That totally does the same thing.