replace reinvention of #parameterize (PR #148)

I didn’t do this before because of the test:

Slug.for("evil#trout").should == "eviltrout"

But if yall can live with this:

Slug.for("evil#trout").should == "evil-trout"`

…then we can drastically simplify the slugger instead of reinventing ActiveSupport’s slugger.

GitHub

I most definitely can! Thanks :fish: