NX-485: refactor plugin configuration to re-use Sisu's BundlePlan
Cleanup extender
Extra test client protection against null reponses
Decouple NexusServletModule from rest of nexus-core
NX-485: unpick nexus core uber-bundle
Bump sisu-resource-scanner version to pick up bundle with sisu index
Cleanup duplicate javax.mail and other related bundles
Use getResource to check for existence of plexus XML in plugins
Clean up boot activation