Fixes #97 - expand check for panorama in create_from_device

Author: shinmog

pandevice/base.py

@@ -2970,7 +2970,7 @@ def create_from_device(cls,
         system_info = device.refresh_system_info()
         version = system_info[0]
         model = system_info[1]
-        if model == "Panorama":
+        if model == "Panorama" or model.startswith('M-'):
             instance = panorama.Panorama(hostname,
                                          api_username,
                                          api_password,