add functions/vendor files

vendor/github.com/gin-gonic/gin/deprecated.go

@@ -0,0 +1,12 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import "log"
+
+func (c *Context) GetCookie(name string) (string, error) {
+	log.Println("GetCookie() method is deprecated. Use Cookie() instead.")
+	return c.Cookie(name)
+}