AUI-1408 - Mark aui-scheduler day view accessible

Hi Rob,

I updated my changes based on @Mairatma's comments on this pull: https://github.com/mairatma/alloy-ui/pull/15.

The scope of the changes for this ticket are limited to just the 'day' view event creation, but because the other views extend the day view, there will be some partially functioning accessibility on the other views. 

Please let me know if you have any questions.

Thanks!