Improve Spec template

Here's a somewhat more luxurious spec template that optionally imports Expecta with the short-hand syntax and comes with an icon to boot:

![templateicon](https://f.cloud.github.com/assets/212465/2346360/3cd69e00-a541-11e3-8e81-bc993c561923.png)

As per https://github.com/specta/expecta/pull/82