Partial fix for #23 - incorrect resource type inheritance

[econchick]

• When a resource type is defined with one method that is optional and is applied to a resource that does not have that method defined, the resource’s method should not inherit from the optional method
• When a resource inherits a resource type but explicitly defines named parameters, the named parameters in the resource should overwrite those that are inherited

Inheritance order of traits and handling resource types inheriting other resource types still in progress.