[UI 1.12] jQuery UI: Article on the classes option

[tjvantoll]

WIP. I need to make another pass at this after we decide if we're moving forward with _addClass() and _removeClass().

[RedWolves]

First sentence, "...works on any other..." need the word 'on' in that sentence.

[scottgonzalez]

Not "on", but "like".

[RedWolves]

This is an awesome start!

[scottgonzalez]

checkout -> check out, unless you actually want them to clone and checkout the code.

[arthurvr]

@tjvantoll Wanne update the PR a little?

[tjvantoll]

@arthurvr I'm waiting for the _addClass(), _removeClass(), and _toggleClass() APIs to finalize before addressing the comments and finishing this article.

[jzaefferer]

I think the API is now final, could update this.

[tjvantoll]

I addressed all comments and finished the section on custom widgets. This is ready for a review (although note that this shouldn't go live until jQuery UI 1.12 does).

[arschmitz]

This is not entirely true it maps structural class names to theme class's ( both custom and built in ). You are also doing more then just making the dialog red here you are also removing the rounded corners.

[arschmitz]

Just as a general comment on the last half of this article on custom widgets. I think that if we are going to get into the use of the new methods in your own widgets we should get into more detail and fully explain their use ( and probably mention some common pitfalls people will run into ). Otherwise i think we should stick to explaining how to use the option and leave custom widgets for another more in depth article or just to the api site.