Allow custom HTTP status code error ranges (#308)

Adding support for custom HTTP status code error ranges

lib/adapters/http.js

@@ -9,13 +9,7 @@ var url = require('url');
 var zlib = require('zlib');
 var pkg = require('./../../package.json');
 var Buffer = require('buffer').Buffer;
-
-// Resolve or reject the Promise based on the status
-function settle(resolve, reject, response) {
-  (response.status >= 200 && response.status < 300 ?
-    resolve :
-    reject)(response);
-}
+var settle = require('../helpers/settle');
 
 /*eslint consistent-return:0*/
 module.exports = function httpAdapter(resolve, reject, config) {

lib/adapters/xhr.js

@@ -6,6 +6,7 @@ var parseHeaders = require('./../helpers/parseHeaders');
 var transformData = require('./../helpers/transformData');
 var isURLSameOrigin = require('./../helpers/isURLSameOrigin');
 var btoa = (typeof window !== 'undefined' && window.btoa) || require('./../helpers/btoa');
+var settle = require('../helpers/settle');
 
 module.exports = function xhrAdapter(resolve, reject, config) {
   var requestData = config.data;
@@ -73,11 +74,7 @@ module.exports = function xhrAdapter(resolve, reject, config) {
       request: request
     };
 
-    // Resolve or reject the Promise based on the status
-    ((response.status >= 200 && response.status < 300) ||
-     (!('status' in request) && request.responseText) ?
-      resolve :
-      reject)(response);
+    settle(resolve, reject, response);
 
     // Clean up request
     request = null;