Added "icon" option for UI Dialog

[alexeevdv]

You can see example here: http://jsfiddle.net/alexeevdv/9C9Ak/

[scottgonzalez]

We'd like to hold off on this for now and see how popular it is as an extension first. For examples of extensions, see https://github.com/scottgonzalez/jquery-ui-extensions or the back-compat in 1.9.x tabs for newer syntax:

jquery-ui/ui/jquery.ui.tabs.js

Line 853 in a0098ea

// DEPRECATED

I do have a few recommendations though. Remove .ui-dialog-titlebar-icon-spacer and instead conditionally add padding to the title text (see accordion for an example). Don't check the type of the icon option, since there's only one valid type (and all falsey values should be treated the same). If the icon option starts with a value and is then removed, you need to handle that state properly. Finally, you might consider an icons hash for consistency, even if there's only one icon.

Thanks for your contribution, hopefully another patch of yours will make it in.