add basic dns function thingies

modules/dns/README.md

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+## DNS 
+
+Performs and reports upon basic DNS functions.
+
+### Description
+
+This module utilises the domain name system to discover basic information about
+domain names and IP addresses.
+
+### Commands
+
+#### ~lookup [domain name]
+Looks up the specified domain name in the domain name system. If a match is found,
+the first corresponding A or AAAA record is displayed.
+#### ~rdns [IP address]
+Looks up the specified IP address in the domain name system. If a match is found,
+the first corresponding rDNS domain name is displayed.

modules/dns/dns.js

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+/**
+ * Module Name: DNS 
+ * Description: Performs and reports on basic DNS functions.
+ */
+var dnsmod = require('dns');
+
+var dns = function(dbot) {
+    var commands = {
+        '~lookup': function(event) {
+            domain = event.params[1];
+            dnsmod.lookup(domain, function (error, addr) {
+                if (error) {
+                    console.log(error);
+                    event.reply(dbot.t("lookup-error",{"domain": domain, "code": error.code}));
+                } else {
+                    event.reply(dbot.t("lookup",{"domain": domain, "address": addr}));
+                }
+            });
+        },
+        '~rdns': function(event) {
+            ip = event.params[1];
+            try {
+                dnsmod.reverse(ip, function (error, domain) {
+                    if (error) {
+                        throw error;
+                    }
+                    event.reply(dbot.t("rdns",{"domain": domain, "ip": ip}));
+                });
+            } catch (err) {
+                    event.reply(dbot.t("rdns-error",{"domain": domain, "ip": ip, "error": err}));
+            }
+        }
+            
+    };
+    this.commands = commands;
+
+    this.on = 'PRIVMSG';
+};
+
+exports.fetch = function(dbot) {
+    return new dns(dbot);
+};

modules/dns/strings.json

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+{
+    "lookup-error": {
+        "en": "{domain} is \u000303AVAILABLE! \u000314({code})"
+    },
+    "lookup": {
+        "en": "{domain} is \u000305TAKEN! \u000314({address})"
+    },
+    "rdns": {
+        "en": "{ip} \u2192 {domain}"
+    },
+    "rdns-error": {
+        "en": "Unable to lookup {ip}. \u000314({error})"
+    }
+}