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Pants

Question for folks with custom plugins.  Do any of you pass source_rel_path in any of these? ... mainly looking jvm_target.py and python_target.py:
```
$ git grep "sources_rel_path=None" -- **/*.py | grep targets/
contrib/cpp/src/python/pants/contrib/cpp/targets/cpp_target.py:               sources_rel_path=None,
contrib/node/src/python/pants/contrib/node/targets/node_module.py:               sources_rel_path=None,
src/python/pants/backend/jvm/targets/jvm_target.py:               sources_rel_path=None,
src/python/pants/backend/python/targets/python_target.py:               sources_rel_path=None,
```