Begin refactor out of common http repository logic
Feature flag for which repo to use in environment
Tests for UserConfigHttpRepository
Passing tests for UserConfigHttpRepository
tests for get_user_repository
test url encoding and fix pep8s
Fix urlencoding tests
Use get_user_repository for get correct user repo
Name to data_set_name, value to identifier.

test value error if no identifier
Merge pull request #285 from alphagov/users-from-stagecraft

Users from stagecraft

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