Deprecating success/error in favor of then/catch

lib/axios.js

@@ -28,8 +28,23 @@ var axios = module.exports = function axios(config) {
     }
   });
 
+  function deprecatedMethod(method, instead, docs) {
+    try {
+      console.warn(
+        'DEPRECATED method `' + method + '`.' +
+        (instead ? ' Use `' + instead + '` instead.' : '') +
+        ' This method will be removed in a future release.');
+
+      if (docs) {
+        console.warn('For more information about usage see ' + docs);
+      }
+    } catch (e) {}
+  }
+
   // Provide alias for success
   promise.success = function success(fn) {
+    deprecatedMethod('success', 'then', 'https://github.com/mzabriskie/axios/blob/master/README.md#response-api');
+
     promise.then(function(response) {
       fn(response.data, response.status, response.headers, response.config);
     });
@@ -38,6 +53,8 @@ var axios = module.exports = function axios(config) {
 
   // Provide alias for error
   promise.error = function error(fn) {
+    deprecatedMethod('error', 'catch', 'https://github.com/mzabriskie/axios/blob/master/README.md#response-api');
+
     promise.then(null, function(response) {
       fn(response.data, response.status, response.headers, response.config);
     });