Rapture JSON support for case class defaults

jsonDefaults.scala

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scala> import rapture.json._
import rapture.json._

scala> import jsonBackends.jawn._
import jsonBackends.jawn._ // This also works with Play, Spray, Argonaut, JSON4S and Lift

scala> val fruits = json"""[{ "name": "Tangerine" }, { "name": "Lemon", "color": "yellow" }, { "name": "Orange" }, { "name": "Peach", "citrus": false }]"""
fruits: rapture.json.Json = [{"name":"Tangerine"},{"color":"yellow","name":"Lemon"},{"name":"Orange"},{"name":"Peach","citrus":false}]

scala> case class Fruit(name: String, color: String = "orange", citrus: Boolean = true)
defined class Fruit

scala> fruits.as[Set[Fruit]]
res0: scala.collection.immutable.Set[Fruit] = Set(Fruit(Tangerine,orange,true), Fruit(Lemon,yellow,true), Fruit(Orange,orange,true), Fruit(Peach,orange,false))