Removed unused redis code from KueService tests
Use mongodb in production
Added mms agent
Fixed issue that prevented appending new videos
Rewrote youtubedl scraper as an event emitter

The scraper now emits video objects as they come in. Before the entire youtube-dl child process would have to complete before the video objects were made available.
Added noop to KueServices if callback not provided
Added KueService test to prevent dupe jobs