Added USB print stub

USBPrintDevice.py

@@ -0,0 +1,6 @@
+from UM.StorageDevice import StorageDevice
+from UM.Signal import Signal, SignalEmitter
+
+class USBPrintDevice(StorageDevice, SignalEmitter):
+    def __init__(self):
+        super().__init__()

__init__.py

@@ -0,0 +1,15 @@
+from . import USBPrintDevice
+
+def getMetaData():
+    return {
+        'type': 'storage_device',
+        'plugin': {
+            'name': 'Local File Storage',
+            'author': 'Jaime van Kessel',
+            'version': '1.0',
+            'description': 'Accepts G-Code and sends them to a printer. '
+        }
+    }
+
+def register(app):
+    return USBPrintDevice.USBPrintDevice()