Create action_cable_overview.md resolves #23176 [ci skip]
Create action_cable_overview.md resolves #23176 [ci skip]

Rails Guide for Action Cable

Added content from README

Pull additional information from Action Cable README and restructured Client/Server elements

Update to list numbering

Switched from list numbers to headings in the examples
Change AppearancesChannel to AppearanceChannel

Word missing

fixed missing word.

Removed Mistaken nesting of Channel class

Removed nesting of ChatChannel and AppearanceChannel from within ApplicationChannel Module. (Copy&Paste error)

Incorporated first round of comments

1. Capitalize "action cable"
2. Separated "Consumers require... via JavaScript" into two sentences
3. Minor typographical correction (remember...)
4. Extra backtick
5. Revised text which implied Redis was the exclusive storage adapter to reflect it's position as default.
6. Revised reference to denote correct config file location: config/cable.yml
7. Added adapter: redis to environment configuration blocks
8. Capitalized "R" for "Rack"
9. Revised syntax for routing to reflect the hash syntax. (to: NOT :to =>)
10. Removed reference to Action Cable being separate from Rails.
11. Began revision for adapter API [I believe this requires a reformatting of the 'Redis' portion of the configuration section to simply "Storage Adapters"]
12. Celluloid -> Concurrent-ruby

Moved errant grave mark [ci skip]

Reordered "In App" above "Standalone" [ci skip]

Reordered to reflect "In App" as preferable to "Standalone"

Action Cable Deployment [ci skip]

Removed paragraph that alludes to Action Cable not being able to run in the same process as Rails.

Removed EM reference and updated deployment [ci skip]

Removed explicit multi-threaded server dependency reference [ci skip]

Revised Configuration and fixed typos [ci skip]

Switched Lifecycle Graphic for Detailed Description [ci skip]

Switched from Lifecycle graphic to detailed description to facilitate revision and maintainability in the future.

Capitalized Heading (typo) [ci skip]

Implemented merged commits from README [ci skip]

Pulled over all (or at least I believe all) merged commits from README. (Dec 14, 2015 - Feb 11, 2016)

Editorial - Capitalize WebSockets [ci skip]

Reformated lines to ~75 characters [ci skip]

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