Have snerk act mean when someone thanks it

I have yet to see an instance of someone genuinely thank snerk for
something. It only happens when it does something unhelpful.
Make snerk a little smarter about being mean
Make snerk a little smarter about being mean, attempt 2

Bah, I'm stupid.
Also recognize 'ty' when being mean
Merge pull request #4 from MatmaRex/patch-1

Have snerk act mean when someone thanks it