Adding "Any" to Json

[Narigo]

Since Vert.x stopped supporting adding every kind of objects like Jackson does, I believe we should get rid of this part:

https://github.com/vert-x/mod-lang-scala/blob/master/src/main/scala/org/vertx/scala/core/json/Json.scala#L59-62

This tries to map everything into a JsonArray/JsonObject but might be the cause of failure for this issue over here: vert-x/mod-mysql-postgresql#17

[galderz]

@Narigo I think it makes sense. Did you try removing that and see if it makes the issue go away? It'd be good to have proof that the fix actually solves that issue.