Final commit to push malus to version 0.3. Changes include:
* Changed symbol naming to Java/Script scheme
* Reimplemented module and extension management. This will make it easier to
  add new features in the future
* The naming convention inside info files has also changed and applications
  must be adapted accordingly
* Renamed root extension point from "/" to "/malus/root"
* Added extension point "/malus/shutdown-notification". Extensions will be
  called upon shutdown.