add source plugin invocation to generate *-sources.jar during build
add source plugin invocation to generate *-sources.jar during build

oskopek/jfreechart-fse,greearb/jfreechart-fse-ct,greearb/jfreechart-fse-ct,jfree/jfreechart-fse,oskopek/jfreechart-fse,jfree/jfreechart-fse