I can no longer build in the roboguice/roboguice directory, it always fails: 

```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.10:check (checkstyle-check) on project roboguice: Failed during checkstyle configuration: cannot initialize module SuppressionFilter - Cannot set property 'file' in module SuppressionFilter to './test_suppressions.xml': unable to find ./test_suppressions.xml: InvocationTargetException: ./test_suppressions.xml (No such file or directory) -> [Help 1]
```