[Backend] Grab tasks from Canvas

[fmcubium]

See issue #86.

The script should be located somewhere in the backend and the cron job should run every so often if the user has an account synced. Please explain what you used to implement the cron job in the PR that fixes this issue.

[spartan231]

Could you add me to this for my CEN3031 Open Source contribution?

[anthisse]

@spartan231 you've been assigned this issue