Use more common junit version as dependency in copy-jars IT

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
install-artifact: skip test-scope dependencies

The purpose of the install-artifact goal is not to set up test
environments, but to copy the final artifacts long after they were
tested and deployed (or installed). Therefore, test-scope dependencies
should not be copied at all.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Verify that install-artifact does not copy test-scope dependencies

For simplicity, we just add this on top of the copy-jars integration
test. That way, we can reuse its just-built and just-installed artifact.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge pull request #9 from imagej/no-test-deps

Do not install test-scoped dependencies