1.2.rev82

### bootstrap.js
* fixed issue, this got introduced with the new submenu xbl. where
scrollbar was showing on collapse of menu, issue was `transitionend`
function was firing for submenu opacity change.
```
"running transitionend func" transitionend { target:
<box.profilist-tbb-box.profilist-create.profilist-do_not_auto_remove>,
animationName: undefined, pseudoElement: "" } bootstrap.js:1951 the
three differing props: elapsedTime:0.15000000596046448
originalTarget:<xul:box.profilist-submenu> propertyName:opacity
"running transitionend func" transitionend { target: <stack>,
animationName: undefined, pseudoElement: "" } bootstrap.js:1951 the
three differing props: elapsedTime:0.25 originalTarget:<stack>
propertyName:height
```