added a Device class

slic/devices/device.py

@@ -0,0 +1,26 @@
+from slic.core.adjustable import Adjustable
+from slic.utils.printing import printable_dict
+from .basedevice import BaseDevice
+
+
+class Device(BaseDevice):
+
+    def __init__(self, Id, name=None, description=None, z_undulator=None):
+        self.Id = Id
+        self.name = name
+        self.description = description
+        self.z_undulator = z_undulator
+
+
+    def __repr__(self):
+        to_print = {}
+        for key, item in self.__dict__.items():
+            if not isinstance(item, (Adjustable, Device)):
+                continue
+            to_print[key] = str(item)
+
+        head = self.description or self.name or self.Id
+        return printable_dict(to_print, head)
+
+
+