Convert tabs to spaces in NarManager and NarIntegrationTestMojo
Fix NarIntegrationTestMojo.getArtifacts() to correctly return all NAR dependencies

This causes the inherited behavior of downloading and unpacking all NAR dependencies
and their attached artifacts to work correctly. The prior implementation excluded them.
Explicitly add NAR dependencies to Surefire classpath in NarIntegrationTestMojo

NAR dependencies weren't included because they're not injected as classpathElements.