Add copyright headers

cura/Machines/ContainerGroup.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from typing import List, Optional
 
 from PyQt5.Qt import QObject, pyqtSlot

cura/Machines/ContainerNode.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from typing import Optional
 
 from collections import OrderedDict

cura/Machines/MaterialManager.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from collections import defaultdict, OrderedDict
 from typing import Optional
 

cura/Machines/Models/BuildPlateModel.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from PyQt5.QtCore import Qt
 
 from UM.Application import Application

cura/Machines/QualityManager.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from typing import Optional
 
 from PyQt5.Qt import pyqtSignal