Made PasswordHelper thread-safe to fix occasional exception from plexus-cipher when making concurrent calls to this singleton component
Merge pull request #398 from sonatype/thread_safe_password_helper

Thread-safe PasswordHelper
always set groupId of plugin, never use the default
set version to 3.0.0-SNAPSHOT
nexus-compat module was removed drop DM
note about nexus.configuration.version
Merge remote-tracking branch 'origin/master' into rapture