Adding cancellation support

test/unit/adapters/http.js

@@ -320,5 +320,21 @@ module.exports = {
         });
       });
     });
+  },
+
+  testCancel: function(test) {
+    var source = axios.CancelToken.source();
+    server = http.createServer(function (req, res) {
+      // call cancel() when the request has been sent, but a response has not been received
+      source.cancel('Operation has been canceled.');
+    }).listen(4444, function() {
+      axios.get('http://localhost:4444/', {
+        cancelToken: source.token
+      }).catch(function (thrown) {
+        test.ok(thrown instanceof axios.Cancel, 'Promise must be rejected with a Cancel obejct');
+        test.equal(thrown.message, 'Operation has been canceled.');
+        test.done();
+      });
+    });
   }
 };