Enable individual assertion messages to be shown in verbose mode

When a test fails we get the name of the failing test but not the reason it failed:

![before](https://f.cloud.github.com/assets/926283/2019442/1ebbee74-8823-11e3-8a54-891e2fcbb9a7.png)

Perhaps we could show the assertion results ( only in verbose mode ) to give a little more info back to the user:

![showassertions](https://f.cloud.github.com/assets/926283/2019447/4149e90a-8823-11e3-998c-d704ec04108a.png)

What say you?