Option properties are not described correctly, and all properties are being described as optional

A case class property of type Option[T] should be represented in the Swagger model as a property of type T; the optional nature of the property would be indicated by required: false.

Instead, Option is being treated like any other Iterable type, so the model appears to have an array property with items of type T— and required is always being set to false. Properties that are not Options should be assumed to be required (or at least it should be possible to tell Swagger to behave that way, if you're never going to use nulls).

[fehguy]

Fixed by #24