Revert "Update Webpack + deps, remove now unnecessary polyfills" (#2479)

* Revert "Update Webpack + deps, remove now unnecessary polyfills (#2410)"

This reverts commit 189b34c45a.

* Fix build (#2496)

* Change syntax to see if build passes

* Test commit

* Test with node 10

* Test adding all browsers in travis

* remove other browsers when running on travis

test/manual/basic.html

@@ -7,6 +7,7 @@
 
 An alert should be shown with the <code>{"name":"axios"}</code>
 
+<script src="promise.js"></script>
 <script src="../../dist/axios.js"></script>
 <script>
     axios.get('./fixture.json').then(function(response) {
@@ -17,4 +18,4 @@ An alert should be shown with the <code>{"name":"axios"}</code>
 </script>
 
 </body>
-</html>
+</html>