Add redis support for distributed caching

vendor/github.com/yuin/gopher-lua/ast/token.go

@@ -0,0 +1,22 @@
+package ast
+
+import (
+	"fmt"
+)
+
+type Position struct {
+	Source string
+	Line   int
+	Column int
+}
+
+type Token struct {
+	Type int
+	Name string
+	Str  string
+	Pos  Position
+}
+
+func (self *Token) String() string {
+	return fmt.Sprintf("<type:%v, str:%v>", self.Name, self.Str)
+}