Bug 1023663 - [User story] Calendar day view should start at 8 AM r=millermedeiros

Currently, the patch is for ui review. It is not ready for code review.
Hi @millermedeiros ,
We could have better performance once we use CSS transition to scroll. But the height of the scroller is not fixed during the scroller is scrolling. Watch the video[1] to see the issue. Do you have any idea?
[1]  http://youtu.be/hymKgXMgrlE