Security fix: Prevent bypassing the IP address check for the GitHub Webhook by setting "x-forwarded-for" header to a GH IP address. The proxy used by Nodejitsu appends the req.connection.remoteAddress with a comma seperator if this header is already set, which means the last value is the one we want to test. Thanks to @Ventero for discovering and reporting this flaw privately.
Merge branch 'master' of github.com:OpenUserJs/OpenUserJS.org