AUI-1408 - Mark aui-scheduler day view accessible

So this has all of my changes for the day view in addition to the month view.  I used the changes you made in the month view as an example for the day view.  

I tried to use a single delegate for the enter key and arrow keys but I had to use a separate one for the keyup event.

There's also still an issue that you'll see when creating an event with the enter key and then using arrow keys to expand it.  The event is one spot behind the focus until you release the enter button.  I couldn't figure out why that was.

Please let me know if you have any questions.

Thanks Marc!