Use rand.Reader directly instead of relying upon uuid

uuid did some bit manipulation so actually only guaranteed 122 bits of random data. This change gets us the full 128 bits.

Author: brycekahle

crypto/crypto.go

@@ -1,16 +1,19 @@
 package crypto
 
 import (
+	"crypto/rand"
 	"encoding/base64"
+	"io"
 	"strings"
-
-	"github.com/pborman/uuid"
 )
 
 // SecureToken creates a new random token
 func SecureToken() string {
-	token := uuid.NewRandom()
-	return removePadding(base64.URLEncoding.EncodeToString([]byte(token)))
+	b := make([]byte, 16)
+	if _, err := io.ReadFull(rand.Reader, b); err != nil {
+		panic(err.Error()) // rand should never fail
+	}
+	return removePadding(base64.URLEncoding.EncodeToString(b))
 }
 
 func removePadding(token string) string {