Adding swipe gestures in overview screen

> When on home time, swiping up goes to all_apps, and swiping down goes to normal
> When on a recents tile, swiping up the tile dismisses it, swiping down launches it
> When on a recents tile, swiping up on the hotseat opens allApps.

Change-Id: I59f8c02f5c5d9cb88c0585a083fbc33d33b1c806