Incorrect output from ```edu.usc.softarch.arcade.facts.design.VersionTreeGenerator``` for apache struts.

```edu.usc.softarch.arcade.facts.design.VersionTreeGenerator``` is giving incorrect results for apache struts, possible due to the naming convention:
```
parent-of 2 2
parent-of 2 2
parent-of 2 2
...
```
I'm fixing it right now.