Adds blacklist toggle

Blacklist will reject any user trying to participate from an IP that has
already participated. Add any IPs you want excluded to the whitelist array
Adds blacklist toggle

Blacklist will reject any user trying to participate from an IP that has
already participated. Add any IPs you want excluded to the whitelist array
Merge branch 'checkphp' of github.com:adamblake/Collector into checkphp
Merge pull request #7 from adamblake/checkphp

Adds blacklist toggle