Update HydeSlide Plugins submodule with UI/functionality fixes

Version rev includes CSS update to fix horizontal scrolling on
overflowing notes of TOC.

Fixes chapter item highlighting in conjunction with active slide
highlighting for easier and quicker visual indicators.

![screen shot 2013-07-15 at 1 24 03 pm](https://f.cloud.github.com/assets/352082/800238/2ea87dcc-ed85-11e2-871b-40460daa98a6.png)