Removed NetworkGraph (which was not being used), first attempt at implementing unbalance measurement
Merge branch 'master' of https://github.com/possim/POSSIM

Conflicts:
	configs/defaultconfig.xml
	matlab/ExampleModel.mdl
	matlab/setloads.m
	matlab/writeOutputToFile.m
	src/gridmodel/DistributionTransformer.h
	src/gridmodel/Feeder.h
	src/gridmodel/GridModel.cpp
	src/gridmodel/GridModel.h
	src/gridmodel/Household.cpp
	src/gridmodel/NetworkData.h
	src/loadflow/MatlabInterface.cpp
	src/simulator/Config.cpp
	src/utility/Power.h
	src/vehicle/TrafficModel.cpp