adds backend script which can be run as a cronjob every n minutes to generate new json files for google calendars

- database updated to save google credentials
- database updated to save json calendar information
- json still saved as a json file under userinfo/<user.id>/calendarevents.json

app.py

@@ -1,5 +1,8 @@
 # Configuration
 from server import app
+from backend import routine
+
+routine.start()
 
 if __name__ == "__main__":
     context = ('certificate/xip.io.crt', 'certificate/xip.io.key')#certificate and key files