Overriding the `ATTR_APP_CLASS` attribute with a caplet class causes unexpected behaviour

[circlespainter]

• Clone and gradle capsule any photon branch using the latest capsule
• Clone capsule-daemon and uncomment these two lines, then gradle install
• Run the photon capsule wrapped in a capsule-daemon one (command line from the cloned photon project dir):

sudo CAPSULE_CACHE_DIR=/tmp/capsule java -Dcapsule.log=verbose -Dcapsule.daemon.debug=true -Dcapsule.daemon.user=fabio -Dcapsule.daemon.cwd=`pwd` -Dcapsule.daemon.stdoutFile=stdout.log -Dcapsule.daemon.stderrFile=stderr.log -jar ~/.m2/repository/co/paralleluniverse/capsule-daemon/0.1.0-SNAPSHOT/capsule-daemon-0.1.0-SNAPSHOT.jar build/libs/photon.jar http://www.google.co.it

The capsule verbose and jsvc debug outputs will show that MavenCapsule is not initialized, that appId is null and that photon dependencies are not being included.