Add an admin group when creating a new directory.
AB testing updated to be stateless and calculated at request time
New API to submit identifier for a survey response
Updating so that user-supplied GUID (now identifier) only scoped to a participant
Switching to use randomness of GUIDs which we already have
Merge pull request #350 from alxdarksage/studies

Add an admin group when creating a new directory.
Merge pull request #351 from alxdarksage/ab-testing

AB testing updated to be stateless and calculated at request time
Merge pull request #352 from alxdarksage/survey-responses

New API to submit identifier for a survey response
Merge remote-tracking branch 'base/develop' into develop