feat(package): upgrade to ng v2.3+ (#574)

src/spec/file-drop.directive.spec.ts

@@ -0,0 +1,28 @@
+import { Component } from '@angular/core';
+import { inject, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { FileUploader } from '../file-upload/file-uploader.class';
+import { FileUploadModule } from '../file-upload/file-upload.module';
+
+@Component({
+  selector: 'container',
+  template: `<input type="file" ng2FileSelect [uploader]="uploader" />`
+})
+export class ContainerComponent {
+  public uploader:FileUploader = new FileUploader({url: 'localhost:3000'});
+}
+
+describe('Directive: FileSelectDirective', () => {
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [FileUploadModule],
+      declarations: [ContainerComponent],
+      providers: [ContainerComponent]
+    });
+  });
+
+  it('should be fine', inject([ContainerComponent], (fixture:ComponentFixture<ContainerComponent>) => {
+    expect(fixture).not.toBeNull();
+  }));
+});