- add utf-8 encoding magic comment to recording ruby scripts

record-and-playback/core/lib/recordandplayback.rb

...and-playback/core/lib/recordandplayback/audio_archiver.rb

...playback/core/lib/recordandplayback/deskshare_archiver.rb

...nd-playback/core/lib/recordandplayback/events_archiver.rb

...d-playback/core/lib/recordandplayback/generators/audio.rb

.../core/lib/recordandplayback/generators/audio_processor.rb

...-playback/core/lib/recordandplayback/generators/events.rb

.../lib/recordandplayback/generators/matterhorn_processor.rb

...ack/core/lib/recordandplayback/generators/presentation.rb

...d-playback/core/lib/recordandplayback/generators/video.rb

...yback/core/lib/recordandplayback/presentation_archiver.rb

...and-playback/core/lib/recordandplayback/video_archiver.rb

record-and-playback/core/scripts/archive/archive.rb

record-and-playback/core/scripts/rap-worker.rb

record-and-playback/matterhorn/scripts/ingest-status.rb

record-and-playback/matterhorn/scripts/process/matterhorn.rb

record-and-playback/matterhorn/scripts/publish-matterhorn.rb

record-and-playback/slides/scripts/process/slides.rb

record-and-playback/slides/scripts/publish/slides.rb