Minor Glitches Fix

ProfileProcess
- only logged in user's profile was being populated.

RetrieveRegistrationProcess
- totalDue was being pulled from database before registration was complete.

UpdateRegistrationProcess
- PeopleID was not being set in registrants (even though the registrantID and peopleID has always been the same value)
- Answers are not updated or deleted through the registration endpoint. However, previous registrant's answers were being set to null with each new registrant that was added. Answers should only be updated or deleted through the answers endpoint (this is currently how the front end is set up).

RegistrantService
- CreatedTimeStamp was not always being saved
remove unneeded inject in `RegistrationResourceFunctionalTest`
Restore original loop for answers.
Create deleteRegistrant endpoint and test
Merge pull request #239 from CruGlobal/EVENT-58

Minor Glitches Fix
Create deleteRegistrant endpoint and test
Merge pull request #241 from CruGlobal/EVENT-66

Create deleteRegistrant endpoint and test
Merge branch 'EVENT-24' into EVENT-64
Add ability to save and reference paymentGatewayId
- rename previous paymentGatewayId to paymentGatewayUserSetId