Add self-contained gometalinter build tooling.

tools/vendor/github.com/nbutton23/zxcvbn-go/zxcvbn.go

@@ -0,0 +1,19 @@
+package zxcvbn
+
+import (
+	"github.com/nbutton23/zxcvbn-go/matching"
+	"github.com/nbutton23/zxcvbn-go/scoring"
+	"github.com/nbutton23/zxcvbn-go/utils/math"
+	"time"
+)
+
+func PasswordStrength(password string, userInputs []string) scoring.MinEntropyMatch {
+	start := time.Now()
+	matches := matching.Omnimatch(password, userInputs)
+	result := scoring.MinimumEntropyMatchSequence(password, matches)
+	end := time.Now()
+
+	calcTime := end.Nanosecond() - start.Nanosecond()
+	result.CalcTime = zxcvbn_math.Round(float64(calcTime)*time.Nanosecond.Seconds(), .5, 3)
+	return result
+}