Added Wolfram Alpha module

modules/wolframalpha/README.md

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+## Wolfram Alpha Calculator
+
+Calculates whatever you want.
+
+### Description
+
+This module provides a command which allows users to calculate whatever they want.
+
+It has following dependencies:
+node-wolfram : https://github.com/strax/node-wolfram
+
+### appID
+
+appID has to be added into config.json. It can be obtained at
+http://products.wolframalpha.com/developers/ for free.
+
+### Commands
+
+#### ~calculate [(whatever)]
+
+Example:
+~calculate (2+2)
+~calculate (x^2+2x+4)
+
+### TODO

modules/wolframalpha/strings.json

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+{
+    "result": {
+        "en": "{output}"
+    },
+    "error": {
+        "en": "Something went wrong :( Example:'~calculate (2+2)'"
+    }
+}

modules/wolframalpha/usage.json

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+{
+    "~calculate": "~calculate [(whatever)]"
+}

modules/wolframalpha/wolframalpha.js

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+/**
+ * Module Name: wolframalpha
+ * Description: Calculates all kinds of stuff through Wolfram Alpha.
+ * Requires: node-wolfram [https://github.com/strax/node-wolfram]
+ */
+
+var _ = require('underscore')._,
+	Client = require('node-wolfram');
+
+var wolframalpha = function(dbot) {
+    	this.commands = {
+        	'~calculate': function(event) {
+        		var wolfram = new Client(this.config.appID);
+                var query = event.input[1];
+                wolfram.query(event.input[1], function(err, result) {
+					if(err)
+						event.reply(dbot.t('error'));
+					else
+					{
+						var out = "";
+						for(var a=0; a<result.queryresult.pod.length; a++)
+						{
+							var pod = result.queryresult.pod[a];
+							out += pod.$.title;
+							out +=": ";
+								for(var b=0; b<pod.subpod.length; b++)
+								{
+									var subpod = pod.subpod[b];
+									for(var c=0; c<subpod.plaintext.length; c++)
+									{
+										var text = subpod.plaintext[c];
+										console.log('\t', text);
+										out += text;
+										out += " ; ";
+									}
+								}
+						}
+						event.reply(dbot.t('result',{'output':out}));
+					}
+				});
+			}
+		};
+
+};
+
+exports.fetch = function(dbot) {
+    return new wolframalpha(dbot);
+};