Update xorm and dependencies vendor for feature to dump to other database (#565)

* update xorm and dependencies vendor for feature to dump to other database

* fix golint

vendor/github.com/go-xorm/builder/cond.go

@@ -1,3 +1,7 @@
+// Copyright 2016 The Xorm 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 builder
 
 import (
@@ -5,31 +9,39 @@ import (
 	"io"
 )
 
+// Writer defines the interface
 type Writer interface {
 	io.Writer
 	Append(...interface{})
 }
 
-type stringWriter struct {
+var _ Writer = NewWriter()
+
+// BytesWriter implments Writer and save SQL in bytes.Buffer
+type BytesWriter struct {
 	writer *bytes.Buffer
 	buffer []byte
 	args   []interface{}
 }
 
-func NewWriter() *stringWriter {
-	w := &stringWriter{}
+// NewWriter creates a new string writer
+func NewWriter() *BytesWriter {
+	w := &BytesWriter{}
 	w.writer = bytes.NewBuffer(w.buffer)
 	return w
 }
 
-func (s *stringWriter) Write(buf []byte) (int, error) {
+// Write writes data to Writer
+func (s *BytesWriter) Write(buf []byte) (int, error) {
 	return s.writer.Write(buf)
 }
 
-func (s *stringWriter) Append(args ...interface{}) {
+// Append appends args to Writer
+func (s *BytesWriter) Append(args ...interface{}) {
 	s.args = append(s.args, args...)
 }
 
+// Cond defines an interface
 type Cond interface {
 	WriteTo(Writer) error
 	And(...Cond) Cond
@@ -41,6 +53,7 @@ type condEmpty struct{}
 
 var _ Cond = condEmpty{}
 
+// NewCond creates an empty condition
 func NewCond() Cond {
 	return condEmpty{}
 }