Build: Add manifest entry for selectmenu

Closes gh-1240
Build: Fix manifest dependencies

Clone bower dependencies instead of reusing and modifying the same object
multiple times.
Menu: Vertically center icons. Fix menu item wiggle and clearing in IE8

Fixes #9995
Closes gh-1235
Widget: Remove misleading comment
Authors: Update
Tabs: Move `aria-expanded` from active panel to active tab

Fixes #9622
Closes gh-1251
README: Remove content that exists on the contribute site
Build: Update DB version for release script
Tests: Add widget option

Allows running qunit tests for a single widget

Closes gh-1254
Spinner: Don't change value when changing min/max options

Fixes #9703
Closes gh-1252
Dialog: Fix off() -> unbind() for jQuery 1.6 compat

Follows-up c9815f13b487d027ef9b.

Fixes #10072
Closes gh-1256