Added Wrapf method which takes the usual fmt.Printf arguments. Thanks @umairidris. Fixes #6
pkg/errors now has an A+ Go report card. Thanks @umairidris
Bug fixes since 0.1.0
Wrap would incorrect interpret fmt like verbs as format arguments, corrupting the error message. Thanks @enisoc
errors.loc.Location (and errors.Fprint) now more reliably detect the full package path, even in the presence of vendoring or multiple GOPATH segments. Thanks @ChrisHines. Fixes #8
