add vendor

vendor/github.com/wendal/errors/README.md

@@ -0,0 +1,31 @@
+errors
+======
+
+增强型errors包(for golang)
+--------------------------
+
+完全兼容官方的errors包,且附带堆栈信息,方便debug
+----------------------------------------------
+
+API完全兼容
+
+安装
+----
+
+```
+go get github.com/wendal/errors
+```
+
+使用
+----
+
+仅需将
+```
+import errors
+```
+
+改为
+```
+import github.com/wendal/errors
+```
+

vendor/github.com/wendal/errors/errors.go

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+// Copyright 2011 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.
+// And Modify By Wendal (wendal1985@gmail.com)
+
+// Package errors implements functions to manipulate errors.
+package errors
+
+import (
+	"runtime/debug"
+)
+
+var AddStack = true
+
+// New returns an error that formats as the given text.
+func New(text string) error {
+	if AddStack {
+		text += "\n" + string(debug.Stack())
+	}
+	return &errorString{text}
+}
+
+// errorString is a trivial implementation of error.
+type errorString struct {
+	s string
+}
+
+func (e *errorString) Error() string {
+	return e.s
+}