Transitions should use CSS3

[rixth]

If CSS3 transitions are used for animateSlide they'll benefit from hardware acceleration, and the page weight will be considerably less as d3 will no longer be needed.

[mikegagnon]

Great point. Added to the todo list:

• http://mikegagnon.com/sidenote/#1#main:Top#todo:todo%20list#usecss3:Transitions%20should%20use%20CSS3
• 838befa

The only reason I started with D3 is because that is what I am already familiar with.

Thanks!