Provide better type safety when lealing with maps of bound variables.
Minor cleanup in test.
Clean up test
Clarify order of dependencies.
Cleanup test resources.
Merge branch 'master' of https://github.com/play-project/play-dcep

Conflicts:
	play-dcep-distributedetalis/src/test/java/eu/play_project/dcep/distributedetalis/test/PrologJtalisTest.java