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.

Example:
========
    bin/rails generate channel Chat speak

    creates a Chat channel class, test and JavaScript asset:
        Channel:    app/channels/chat_channel.rb
        Test:       test/channels/chat_channel_test.rb
        Assets:     $JAVASCRIPT_PATH/channels/chat_channel.js