Added test_mode config keys
AlphaMailService only take key as param
Add testMode to abstract service and interface
Add documentation
Add default test mode to docs
Add testMode to AlphaMail
Add testMode to ElasticEmail
Add testMode to MailGun
Refactor ElasticEmail to return array instead of nothing when in testmode
Add testMode to MailGun
Add testMode to Mandrill
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Added test mode to Postage
Added test mode to Postmark
Added test mode to Postmark
Added test mode to Postmark
Added test mode to Ses