move back Invalidating to not necessarily be a Widget
inherit from Stateful
update CONTRIBUTING.md to be more inline with current project
Bug fix: widget is now correctly initialized in all cases (including
when using default values for all attributes). Tabindex is now correctly
set in all cases.
Automated tests updated to check all the aria attributes and tab index.
Bug fix: now properly supporting tabIndex setting.
remove useless test on tabIndex value.
as we stopped (momentarily?) using setTimeout, stop using remove() accordingly
tabIndex management.
fix README typo and list exact commands to execute
add fix and test for when widget doesn't declare tabIndex property
woops, fix typo in test file
using simplified tabIndex management following bug fix in dui/Widget
Tests for dui/register.

Can be run in a browser via:

http://localhost/node_modules/intern/client.html?config=dui/tests/infrastructure/default-conf
(adjusted depending on where dui is relative to your web root)
Destroyable & Widget-attr intern tests; not sure if IE10 classList is acceptable
Refactor Slider to use refreshRendering instead of _setXXXAttr.
fix newlines
Get infrastructure tests running in Sauce Labs.
Doc bower install of dependencies.
Also link to docs directory.
fix tabbing in Widget-attr.js
Handle style prop passed to constructor on Safari.