Fix test

1. model needs to live in proper package
2. if you define your own context, don't import com.novus.salat.global._

Working now :)

```
{ "_typeHint" : "model.MenuHeader" , "title" : "Dinner" , "children" : [ { "_typeHint" : "model.MenuHeader" , "title" : "Appetizer" , "children" : [ { "_typeHint" : "model.MenuItem" , "title" : "Spring Roll" , "price" : 1.0} , { "_typeHint" : "model.MenuItem" , "title" : "Chicken Tikka" , "price" : 2.0} , { "_typeHint" : "model.MenuHeader" , "title" : "Children Only" , "children" : [ { "_typeHint" : "model.MenuItem" , "title" : "Ice Cream" , "price" : 3.0}]}]}]}
MenuHeader(Dinner,List(MenuHeader(Appetizer,List(MenuItem(Spring Roll,1.0), MenuItem(Chicken Tikka,2.0), MenuHeader(Children Only,List(MenuItem(Ice Cream,3.0)))))))
```