This requires us to set fullscreen="false" in our cordova apps.
Uses the resize event to determine when the keyboard has been shown,
then broadcasts an event from the activeElement: 'scrollChildIntoView',
which is caught by the nearest parent scrollView. The scrollView will
then see if that element is within the new device's height (since the
keyboard resizes the screen), and if not scroll it into view.
Additionally, when the keyboard resizes the screen we add a
`.hide-footer` class to the body, which will hide tabbars and footer
bars while the keyboard is opened.
For now, this is android only.
Closes#314.
Fixes#521. Reordering now uses webkitTransform instead of
element.style.left. Additionally, as you drag the drag-element to the
top or bottom of the scroll-area, it will scroll it up or down as
allowed.
Refactors necessary: Common code from `<content>` and `<scroll>` moved
into js/ext/angular/controllers/ionicScrollController. Then `<content>`
and `<scroll>` expose the controller, and `<list>` can require it.
`<list>` then uses the controller (if exists) to pass the scrollView and
scrollEl to ReorderDrag, and ReorderDrag uses that to scroll.
Additionally, js/ext/angular/test/controller/ionicScrollController tests
much functionality that was untested before.
