Add support for Result

[thedevsaddam]

const json = `{"name":{"first":"Tom","last":"Hanks"},"age":61}`
result, err := gojsonq.New().JSONString(json).FindR("name.first")
if err != nil {
    log.Fatal(err)
}
name, _ := result.String()
fmt.Println(name)

[coveralls]

Pull Request Test Coverage Report for Build 318

• 340 of 340 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 309:	0.0%
Covered Lines:	10304
Relevant Lines:	10304

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💛 - Coveralls