Allowed IP feature for checking ips (check.php)

You can now add allowed IPs to $allowedIPs in Experiment/Settings.php.
Any IPs added here willpass any eligibility checks. Make sure that you
leave in the "::1" as it will allow multiple attempts when working
locally.
Merge branch 'checkphp'

Conflicts:
	Code/check.php
	Experiment/Settings.php