The adaptors now propagate valid properties array to parent. Should fix issue 168.
Merge remote-tracking branch 'origin/develop' into feature/scripting-tests

Conflicts:
	src/nl/esciencecenter/octopus/adaptors/gridengine/GridEngineAdaptor.java
	src/nl/esciencecenter/octopus/adaptors/scripting/ScriptingAdaptor.java
	src/nl/esciencecenter/octopus/adaptors/slurm/SlurmAdaptor.java