api.js refactor using classes (#250)

Refactor api.js into an api module where endpoint specific models can be imported and used in components.

src/api/index.js

@@ -0,0 +1,25 @@
+import Config from './models/Config';
+import InstanceGroups from './models/InstanceGroups';
+import Me from './models/Me';
+import Organizations from './models/Organizations';
+import Root from './models/Root';
+import Teams from './models/Teams';
+import Users from './models/Users';
+
+const ConfigAPI = new Config();
+const InstanceGroupsAPI = new InstanceGroups();
+const MeAPI = new Me();
+const OrganizationsAPI = new Organizations();
+const RootAPI = new Root();
+const TeamsAPI = new Teams();
+const UsersAPI = new Users();
+
+export {
+  ConfigAPI,
+  InstanceGroupsAPI,
+  MeAPI,
+  OrganizationsAPI,
+  RootAPI,
+  TeamsAPI,
+  UsersAPI
+};