Teardown now cleans up onAny event

Fixes #43.

Did a bit of research and found out it was the `onAny` event not getting cleaned up (https://github.com/gruntjs/grunt-contrib-jasmine/blob/master/tasks/jasmine.js#L149).

The fix gets through @derickbailey's test branch without any errors.

Before:

![image](https://f.cloud.github.com/assets/56288/384388/2732d994-a64e-11e2-9244-5de540d41967.png)

After:

![image](https://f.cloud.github.com/assets/56288/384383/d6b62854-a64d-11e2-9a3e-26ddb5ce483f.png)