Fix #1390 by making the search box all expandorific

PRETTY SHINY ANIMATIONS!

Pretty straightforward change. Upgraded to jQuery 1.10.2 to get access to ".on". It _could_ be reverted if we needed to, but it seems like a very minor upgrade. We do need to evaluate jQuery 2.x during our redesign...

When you start typing in the search box, it expands to this:

![image](https://f.cloud.github.com/assets/7574/921396/bde1365e-fef7-11e2-8a8e-81d2e403e2d0.png)

Click outside or clear the box and it reverts to normal.

Fixes #1390