Don't use useReactor for the source build

Crowd's source build currently uses useReactor, so it will only include modules that were included in the same build. This means that building the source module alone won't include any source.

Fix this to disable useReactor and include the dependencies directly. As the source distribution will fail during release:prepare (because the release isn't tagged yet) make careful use of profiles to ensure this is only built during release:perform or a specific build targeting this module.