pytest-cov: Incorrect coverage report

Using py.test --cov-config .coveragerc --cov nengo -n 6 nengo a lot of lines that should be hit get reported as missed (like class and function definitions in a module). This might be related to #19 as the project has a conftest file importing other modules from the project.

Using coverage run --rcfile .coveragerc --source nengo -m py.test nengo instead a correct coverage report is generated, but this command does not support xdist.