Stop services on error

[k1o0]

Is your feature request related to a problem? Please describe.
When there is an error the services should be stopped by expServer.

Describe the solution you'd like
Upon an error the cleanup method is run, however the cleanup event is not triggered. Perhaps it should be so that running services are stopped:

Rigbox/+exp/SignalsExp.m

Lines 401 to 419 in cd888f0

	%Trigger the 'experimentCleanup' event so any handlers will be called
	cleanupInfo = exp.EventInfo('experimentCleanup', obj.Clock.now, obj);
	fireEvent(obj, cleanupInfo);
	%do our cleanup
	cleanup(obj);
	%return the data structure that has been built up
	data = obj.Data;
	if ~isempty(ref)
	saveData(obj); %save the data
	end
	catch ex
	obj.IsLooping = false;
	%mark that an exception occured in the block data, then save
	obj.Data.endStatus = 'exception';
	obj.Data.exceptionMessage = ex.message;
	obj.cleanup() % TODO Make cleanup more robust to error states

Additionally it could be useful to include an input arg to services stop methods so that exception UDPs can be sent.