Extra protection against null responses during client tests
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
Use TCCL to deserialize persisted objects from H2