Add NHSBT blood donor appointment collector configs

- browser-usage.json
- completion-by-goal.json
- conversions-by-keyword.json
- conversions-by-landing-page.json
- conversions-by-medium.json
- conversions-by-social-network.json
- conversions-by-source.json
- device-usage.json
- new-returning-count.json
- realtime.json

Updated conjobs
Merge pull request #50 from alphagov/config/blood-donor-appointment-collectors

Add NHSBT blood donor appointment collector configs