Added pretty print JSON to Boon

 puts(Maps.asPrettyJsonString(map));
 puts(Boon.toPrettyJson(map));

Boon.toPrettyJson works with Set, Map, instances, etc.

(

https://github.com/RichardHightower/boon/issues/170

)

Maps.asPrettyJsonString
BeanUtils.asPrettyJsonString (can pass custom mapper)
Lists.asPrettyJsonString 
Sets.asPrettyJsonString

Most people will want to use Boon.toPrettyJson

I am sure there are bugs, but it works mostly now. More testing needed of course.

{
 "name" : "Rick",
 "age" : 45,
 "wife" : {
 "name" : "Diana"
 },
 "children" : [ {
 "name" : "Whitney"
 }, {
 "name" : "Maya"
 }, {
 "name" : "Lucas"
 }, {
 "name" : "Ryan"
 }, {
 "name" : "Noah"
 }],
 "fruit" : ["apple","orange","strawberry"]
} 

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