Changes to Add new campaign

the recepient_lists response's property type changed from array to object for status 200

added the new optional request property campaign_type

added the new optional request property smart_delivery

the request property from_email became optional

the request property from_name became optional

the request property html_text became optional

the request property recepient_lists became optional

the request property reply_to became optional

the request property subject became optional

added the non-success response with the status 403

added the non-success response with the status 422

added the optional property archive_url to the response with the 200 status

added the optional property created_at to the response with the 200 status

added the optional property recepient_lists/segments to the response with the 200 status

added the optional property smart_delivery to the response with the 200 status