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)