Update HydeSlides plugin to prevent help panel hover click blocking

This addresses a UI bug discovered by @brntbeer. The inactive, hidden help panel of the HydeSlides-Plugin prevent the editable fields from being clicked in the slide deck.

The reason: The absolutely positioned help panel was not rendered offscreen, only made opacity of `0`. The absolute element placed over all other content, including slides preventing the clicking of the editable fields on the preroll slide.

![screen shot 2013-12-09 at 1 32 43 pm](https://f.cloud.github.com/assets/352082/1708603/579d17f6-6111-11e3-9d50-1b2e676b132a.png)
![screen shot 2013-12-09 at 1 33 03 pm](https://f.cloud.github.com/assets/352082/1708604/57aac2fc-6111-11e3-8711-c64a02825602.png)