Replace reqwest via reqwest-without-xhr2

Fork reqwest to https://github.com/ant-design/reqwest,
Remove xhr2 dependency cause it is useless in browser side, it will
cause some bugs in different pack solutions, waiting offcial repo resolve this problem: https://github.com/ded/reqwest/issues/204

ref: #216

components/table/index.jsx

 import React from 'react';
-import reqwest from 'reqwest';
+import reqwest from 'reqwest-without-xhr2';
 import Table from 'rc-table';
 import Checkbox from '../checkbox';
 import FilterDropdown from './filterDropdown';

package.json

@@ -61,9 +61,8 @@
     "rc-upload": "~1.3.1",
     "rc-util": "~2.0.3",
     "react-slick2": "~0.6.6",
-    "reqwest": "~2.0.2",
-    "velocity-animate": "^1.2.2",
-    "xhr2": "~0.1.3"
+    "reqwest-without-xhr2": "~2.0.2",
+    "velocity-animate": "^1.2.2"
   },
   "devDependencies": {
     "autoprefixer-loader": "~2.0.0",