switch to go vendoring

vendor/github.com/open-policy-agent/opa/ast/strings.go

@@ -0,0 +1,18 @@
+// Copyright 2016 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package ast
+
+import (
+	"reflect"
+	"strings"
+)
+
+// TypeName returns a human readable name for the AST element type.
+func TypeName(x interface{}) string {
+	if _, ok := x.(*lazyObj); ok {
+		return "object"
+	}
+	return strings.ToLower(reflect.Indirect(reflect.ValueOf(x)).Type().Name())
+}