store app.logger in Simulation class instance.

dream/platform/__init__.py

@@ -112,7 +112,7 @@ def _runSimulation(parameter_dict, queue):
     klass_name = 'dream.simulation.%s' % \
       parameter_dict['general']['simulationClass']
     klass = __import__(klass_name, globals(), {}, klass_name)
-    result = klass.Simulation().run(parameter_dict)
+    result = klass.Simulation(logger=app.logger).run(parameter_dict)
     queue.put(dict(success=json.loads(result)))
   except Exception, e:
     tb = traceback.format_exc()

dream/simulation/Default.py

@@ -2,5 +2,8 @@ import json
 from dream.simulation.LineGenerationJSON import main as simulate_line_json
 
 class Simulation:
+  def __init__(self, logger=None):
+    self.logger = logger
+
   def run(self, data):
     return simulate_line_json(input_data=json.dumps(data))