Widget: Document & window properties are jQuery-wrapped

Closes gh-205
1.10.22
jQuery.widget: Document 1.11's instance method for all widgets
jQuery.widget: Document that instance can be called on any element

Fixes gh-77
Dialog: Remove array and string notations for position option.
Selectmenu: Add selectmenu entry

Fixes gh-67
Menu: Menu items no longer require <a> tags.
Spinner: Document isValid() method.
Menu: Document _closeOnDocumentClick() extension point
Menu: Added _isDivider() extension point
Dialog: Get rif of "multiple types" for the position option
Menu: Fix typo
Selectmenu: Add missing instance method
All: Update to 1.11.0
1.11.0
Build: Update license

Closes gh-204
Button: Split out `.buttonset()` docs

Fixes gh-97
Closes gh-217
Dialog: Fixing the default value of the `buttons` option

Ref #208