Timer: two zeros in minute field, time in page title

Fixes #964 

Also implements a feature that someone requested on [twitter](https://twitter.com/danielponto/status/489111247640858624) to put the time remaining in the page title:

![2014-07-15--1405452255_158x33_scrot](https://cloud.githubusercontent.com/assets/4411471/3590164/eb182d32-0c55-11e4-87e8-fb1af66dbbbe.png)

Also uses `Spice.onShow` for the event handler as per @moollaza's comment on #959.

Ah, good one. This is better than adding an explicit `.ready()`