routing updated to be more variable and on demand

- calendar json file now generated on demand at download request
- device fingerprint route now added

server/googleHandler.py

@@ -145,6 +145,8 @@ def updateCalendars():
   #   a = flask.session['credentials']
   #   print(a, flush=True) 
   #   print(current_user.getGoogleCredentials(), flush=True)
+    if current_user.getGoogleCredentials() == None:
+        return
 
     credentials = google.oauth2.credentials.Credentials(**current_user.getGoogleCredentials())
     calendars = caltojson.getCalendarList(credentials)