Support source exclusions

[bsideup]

Hi!

It would be very helpful to be able to exclude files but only if they come from dependencies, not project's. Some examples:

• META-INF/LICENSE
• META-INF/NOTICE
• META-INF/versions/9/module-info.class

If we exclude them with the current API, project's files will also get excluded from the final JAR, but that's very undesired.

Thank you!