Sample of new YAML format, contains targets per the design meeting.
Changed so that init has target_name as an additional arg. This was necessary, since job_stream.rb iterates over each target, and the sub-hash passed to instantiate output.rb does not contain the target name.
Removed Sam's address, added Josh, Julie, and Scott's email address -- this is convenient for testing, and will change once we create a unique addresses.yaml for each env.
Changed to create one Output object per 'target' found in an email YAML config.