Description:
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    Stubs out a new cable channel for the server (in Ruby) and client (in CoffeeScript).
    Pass the chanel name, either CamelCased or under_scored, and an optional list of channel actions as arguments.

    Note: Turn on the cable connection in app/assets/javascript/cable.coffee after generating any channels.

Example:
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    rails generate channel Chat speak

    creates a Chat channel class and CoffeeScript asset:
        Channel:    app/channels/chat_channel.rb
        Assets:     app/assets/javascript/channels/chat.coffee