fix: login without reload (verdaccio#678) (verdaccio#679) (verdaccio#914

)

* fix: login without reload (verdaccio#678) (verdaccio#679)

* fix: implements code review suggestions (verdaccio#914)

* refactor: adds scope to the app

* refactor: handles null value from localstorage for username

* refactor: removes text type from <Input />

* refactor: replaces isNull with isNil

* refactor: improves makeLogin method

* refactor: adds error from api constant

* fix: updates error using API_ERROR constant in tests

* refactor: updates regex for moduleMapper in jest config

package.json

@@ -59,6 +59,7 @@
     "babel-eslint": "8.2.6",
     "babel-jest": "23.4.0",
     "babel-loader": "7.1.5",
+    "babel-plugin-dynamic-import-node": "2.0.0",
     "babel-plugin-flow-runtime": "0.17.0",
     "babel-plugin-syntax-dynamic-import": "6.18.0",
     "babel-plugin-transform-async-to-generator": "6.24.1",
@@ -77,8 +78,8 @@
     "babel-register": "6.26.0",
     "babel-runtime": "6.26.0",
     "bundlesize": "0.17.0",
-    "cross-env": "5.1.4",
     "codecov": "3.0.4",
+    "cross-env": "5.1.4",
     "css-loader": "0.28.10",
     "element-react": "1.4.8",
     "element-theme-default": "1.4.13",