Compiles simplejavamail into an Apache Karaf feature.

For project-wide mechanisms such as optional module loading and build-generated metadata, see ../../PROJECT_MECHANISMS_CATALOGUE.md.

Usage in Karaf simılar to:

karaf@root()> repo-add mvn:org.simplejavamail/simplejavamail-karaf-feature/<VERSION>/xml/features
karaf@root()> feature:install simplejavamail-karaf-feature