Separate media processing into its own concern.  Alias activesupport notifications into a concern.  Make stream take an array of event names only.  Add create action ot playlist controller for the purpose of adding new media to the playlist.
Merge pull request #11 from Ravenstine/playlist_add

Separate media processing into its own concern.  Alias activesupport not...
Merge pull request #14 from Ravenstine/master

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