Button: renamed variable
Demos: Added button and input icon-only examples to button test page
Button: Set button text as title attribute value for icon-only buttons.
Button: Only check if the element is an input once.
Theme: Pseudo element for icons.
Theme: One corner class. Deprecate ui-btn-corner-all.
Theme: Added note about deprecating ui-disabled. Switching to Widget Factory's ui-state-disabled.
Button: Icon positioning and padding.