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_null.go

@@ -1,47 +1,59 @@
+// 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 "fmt"
 
-// IsNull
+// IsNull defines IS NULL condition
 type IsNull [1]string
 
 var _ Cond = IsNull{""}
 
+// WriteTo write SQL to Writer
 func (isNull IsNull) WriteTo(w Writer) error {
 	_, err := fmt.Fprintf(w, "%s IS NULL", isNull[0])
 	return err
 }
 
+// And implements And with other conditions
 func (isNull IsNull) And(conds ...Cond) Cond {
 	return And(isNull, And(conds...))
 }
 
+// Or implements Or with other conditions
 func (isNull IsNull) Or(conds ...Cond) Cond {
 	return Or(isNull, Or(conds...))
 }
 
+// IsValid tests if this condition is valid
 func (isNull IsNull) IsValid() bool {
 	return len(isNull[0]) > 0
 }
 
-// NotNull
+// NotNull defines NOT NULL condition
 type NotNull [1]string
 
 var _ Cond = NotNull{""}
 
+// WriteTo write SQL to Writer
 func (notNull NotNull) WriteTo(w Writer) error {
 	_, err := fmt.Fprintf(w, "%s IS NOT NULL", notNull[0])
 	return err
 }
 
+// And implements And with other conditions
 func (notNull NotNull) And(conds ...Cond) Cond {
 	return And(notNull, And(conds...))
 }
 
+// Or implements Or with other conditions
 func (notNull NotNull) Or(conds ...Cond) Cond {
 	return Or(notNull, Or(conds...))
 }
 
+// IsValid tests if this condition is valid
 func (notNull NotNull) IsValid() bool {
 	return len(notNull[0]) > 0
 }