Account settings

I've added a new tab to change the default cronjob settings.

You can now change:

• Default timezone, which is also account timezone.
• Cron server, if you’d like to run cronjobs from a specific server IP
• Auto delete stopped cronjobs
• Auto delete failed cronjobs
• Auto add __random__ to cron job URLs to bypass cache.

For new users only: FastCron will now automatically delete stopped cronjobs after 30 days, and failed cronjobs 365 days. You can change it on the account settings page.