debug模式下，支持json语法高亮

[guonaihong]

Debug函数传入gout.DebugColor()，就可以打开颜色高亮功能。

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/guonaihong/gout"
	"time"
)

func server() {
	router := gin.Default()
	router.POST("/colorjson", func(c *gin.Context) {
		c.JSON(200, gin.H{"str2": "str2 val", "int2": 2})
	})

	router.Run()
}
func main() {
	go server()

	time.Sleep(time.Millisecond * 500)

	err := gout.POST(":8080/colorjson").
		Debug(true). //可以使用gout.NoColor() 输出没有颜色高亮的debug信息
		SetJSON(gout.H{"str": "foo",
			"num":   100,
			"bool":  false,
			"null":  nil,
			"array": gout.A{"foo", "bar", "baz"},
			"obj":   gout.H{"a": 1, "b": 2},
		}).Do()

	if err != nil {
		fmt.Printf("err = %v\n", err)
	}
}