Added rate limiting logging and an error page for hitting the rate limit on opening characters

rpg-docs/server/lib/logRateError.js

@@ -0,0 +1,8 @@
+logRateError = function(reply, ruleInput){
+	// reply = {allowed, timeToReset, numInvocationsLeft}
+	// ruleInput = {userId, clientAddress, type, name, connectionId}
+	console.log(
+		`Limit hit for ${ruleInput.type} "${ruleInput.name}" ` +
+		`by user ${ruleInput.userId} from ${ruleInput.clientAddress}`
+	);
+}