Implement apm test on Windows

Ports over the original test runner from: https://github.com/atom/atom/blob/master/build/tasks/spec-task.coffee

### Success
![screen shot 2014-06-04 at 11 08 58 am](https://cloud.githubusercontent.com/assets/671378/3177773/bb9a9688-ec13-11e3-9a6c-ad8c5b305290.png)

### Failure
![screen shot 2014-06-04 at 11 09 31 am](https://cloud.githubusercontent.com/assets/671378/3177774/bdc3a698-ec13-11e3-858d-9478a71b875f.png)

Closes #122