added API collectors, create/duplicate survey etc

for commit #3b1a80 on fs-v4.0
POST /surveys[?password] - create survey and set the report password
DELETE /surveys/:id - deletes the survey GET|POST|DELETE
/surveys/:id/collectors - view, add, delete collectors POST
/surveys/:id/duplicate - duplicates a survey PUT
/surveys/:id/responses/:response/[?collector&completed]