Wrapper for MaxMind's Proxy Detection service (https://www.maxmind.com/en/proxy)
For minFraud, see this other gem: https://rubygems.org/gems/maxmind
Requires ruby 1.9.x or more
Version 0.0.1 tested with ruby 1.9.3, ruby 2.0.0 and ruby 2.1.5
MaxmindProxyDetection.license_key = 'your_license_key'
# Returns a float between 0.0 and 4.0
proxy_score = MaxmindProxyDetection.score("127.0.0.1")
Note that, apparently, when Maxmind service is queried about the same ip several times, only one call is spent.