tooltips stay on page and cause issues when you clear summoners

[joshmadewell]

We need to clean tooltips off the screen when their parent is removed from the dom. Not sure how to do this but it needs to hapen because it's confusing when you re-enter a summoner and "Jayce" shows up over "Nidalee"

Steps To Reproduce

1. Click a summoner input box
2. Enter a name
3. Hover over anything that provides tooltip while still having summoner input box active
4. Delete what was in the input box
5. Press tab to trigger summoner update

What Should Happen:
Summoner or entire table should be removed from the table along with tooltips

What happens
Summoner removes from table/table removes entirely but tooltip remains.

[joshmadewell]

lawl. that was easy.

http://knockoutjs.com/documentation/custom-bindings-disposal.html