Make Stalker stalk itself

Add basic stalker config for Java to stalker
Set version to 0.4.0
Update stalker dependency
Configure multi-project setup for tests/ subproject

- Add buildscript script plugin

- Reuse buildscript script plugin with all subprojects under
  tests/
Update copyright
Merge pull request #28 from jle/make_stalker_use_stalker

Make stalker use stalker