PHPUnit - Stdout Error Reporting

**Primary Change: Display output from stdout if PHPUnit does not write to stderr**

Previously, if PHPUnit does not output to stderr correctly then a blank Exception would be output to the Symfony console. This makes debugging much more challenging than it should be. 

Before:
![image](https://cloud.githubusercontent.com/assets/3114436/4211918/a18cd546-3892-11e4-9667-b603a8a69d6d.png)

After:
![image](https://cloud.githubusercontent.com/assets/3114436/4211919/a973c62a-3892-11e4-8ab7-4f135fcba269.png)