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

Examples:
    `bin/rails generate channel notification`

    creates a notification channel class, test and JavaScript asset:
        Channel:    app/channels/notification_channel.rb
        Test:       test/channels/notification_channel_test.rb
        Assets:     $JAVASCRIPT_PATH/channels/notification_channel.js

    `bin/rails generate channel chat speak`

    creates a chat channel with a speak action.

    `bin/rails generate channel comments --no-assets`

    creates a comments channel without JavaScript assets.