added new controller cyrrency

app/controllers/currency.js

@@ -0,0 +1,53 @@
+'use strict';
+
+
+exports.index = function(req, res) {
+  var _xhr = function() {
+    if (typeof ActiveXObject !== 'undefined' && ActiveXObject !== null) {
+      return new ActiveXObject('Microsoft.XMLHTTP');
+    } else if (typeof XMLHttpRequest !== 'undefined' && XMLHttpRequest !== null) {
+      return new XMLHttpRequest();
+    } else if (typeof require !== 'undefined' && require !== null) {
+      var XMLhttprequest = require('xmlhttprequest').XMLHttpRequest;
+      return new XMLhttprequest();
+    }
+  };
+
+  var _request = function(url, cb) {
+    var request;
+    request = _xhr();
+    request.open('GET', url, true);
+    request.onreadystatechange = function() {
+      if (request.readyState === 4) {
+        if (request.status === 200) {
+          return cb(false, request.responseText);
+        } else {
+          return cb(true, {
+            status: request.status,
+            message: 'Request error'
+          });
+        }
+      }
+    };
+
+    return request.send(null);
+  };
+
+  _request('https://www.bitstamp.net/api/ticker/', function(err, data) {
+    if (err) {
+      return res.jsonp({
+        status: err.status,
+        message: err.message
+      });
+    }
+
+    var bitstamp = JSON.parse(data);
+
+    res.jsonp({
+      status: 200,
+      data: {
+        bitstamp: parseFloat(bitstamp.last)
+      }
+    });
+  });
+};