Better animation when hovering Nodeschool title.

The animation was a great idea, but it felt too sudden to me. Tried to fix that with this simple commit.

*Before:*
![nodeschool_before](https://cloud.githubusercontent.com/assets/385232/4876070/6450823a-62b4-11e4-8459-401ad58d57f6.gif)

*After:*
![nodeschool_after](https://cloud.githubusercontent.com/assets/385232/4876071/716ccaaa-62b4-11e4-8b37-5df5464a59d3.gif)