Axios create url bug (#2290)

* Fix #2234 

* added spacing --eslint

* added test cases

* removed unexpected cases after updating the code

test/specs/instance.spec.js

@@ -37,6 +37,19 @@ describe('instance', function () {
     });
   });
 
+  it('should make an http request with url instead of baseURL', function () {
+    var instance = axios.create({
+      url: 'https://api.example.com'
+    });
+
+    instance('/foo');
+
+    getAjaxRequest().then(function (request) {
+      expect(request.url).toBe('/foo');
+      done();
+    });
+  });
+
   it('should make an http request', function (done) {
     var instance = axios.create();