Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

vendor/golang.org/x/crypto/curve25519/curve25519_test.go

@@ -1,39 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package curve25519
-
-import (
-	"fmt"
-	"testing"
-)
-
-const expectedHex = "89161fde887b2b53de549af483940106ecc114d6982daa98256de23bdf77661a"
-
-func TestBaseScalarMult(t *testing.T) {
-	var a, b [32]byte
-	in := &a
-	out := &b
-	a[0] = 1
-
-	for i := 0; i < 200; i++ {
-		ScalarBaseMult(out, in)
-		in, out = out, in
-	}
-
-	result := fmt.Sprintf("%x", in[:])
-	if result != expectedHex {
-		t.Errorf("incorrect result: got %s, want %s", result, expectedHex)
-	}
-}
-
-func BenchmarkScalarBaseMult(b *testing.B) {
-	var in, out [32]byte
-	in[0] = 1
-
-	b.SetBytes(32)
-	for i := 0; i < b.N; i++ {
-		ScalarBaseMult(&out, &in)
-	}
-}