Basic wikipedia conversation definition and extra_endpoints for new conversations.
Handle extra endpoints in wizard-created conversations as well.
Handle extra_endpoints in go_api.
Remove old wikipedia conversation types from settings and update setup_env configs.
Add tests for new wikipedia views, remove old wikipedia views.
Merge branch 'feature/issue-413-wikipedia-conversation-definition' into develop-frontend
Merge branch 'develop-frontend' of github.com:praekelt/vumi-go into develop-frontend