Update AUTHORS.txt.
Widget Bridge: Make the _init method optional. Add tests for both states. Fixes #9543 - Widget bridge: Make _init() optional.
Spinner: Add isValid method. Fixes #9542 - Spinner: Add isValid() method
Widget: Only remove hover and focus classes when disabling, not enabling. Fixes #9558 - Widget: .enable() while already enabled kills ui-state-focus and ui-state-hover.
Menu: Only focus menu after click if focus is on an element within menu. Fixes #9044 - Menu: Autofocus issue with dialog opened from menu widget
Build: Update grunt-compare-size to latest, add it's .sizecache.json to .gitignore
Build: Remove the build task and it's dependencies. Will bring back testing against minified files later.