[Update] MDCScrollBarLabel 0.1.3

An animated scroll bar to present extra information when
scrolling on a UIScrollView.

Y'know, like the clock on Path.

![MDCScrollBarLabel GIF](http://f.cl.ly/items/2U3d0j3G3O2j1W1Q3525/mdcscrollbarlabel.gif)
Merge pull request #10443 from modocache/update-MDCScrollBarLabel-0.1.3

[Update] MDCScrollBarLabel 0.1.3