Feature/xunit reporter

## What this does
Adds a `-reporter xunit` option to xctool for integration with CI systems such as Jenkins which use xUnit/JUnit etc 

### In Action:
Package:
![](http://dl.dropbox.com/u/25940783/Screenshots/e9w5.png)

Test Suites:
![](http://dl.dropbox.com/u/25940783/Screenshots/wqcx.png)