title: Froala editor doesn't work for Angular 4 with typescript
body: <p>I using angular 4 with type script and I installed ng2-froala-editor and when I want to npm start occurs error </p>
  
  <pre><code>[at-loader] ./node_modules/ng2-froala-editor/ng2-froala-editor.d.ts:1:1 
  TS6053: File './node_modules/typings/globals/core-js/index.d.ts' not found.
  errors @ client?0fb1:119
  sock.onmessage @ socket.js?e5d0:37
  EventTarget.dispatchEvent @ eventtarget.js?3e89:51
  (anonymous) @ main.js?45b8:274
  SockJS._transportMessage @ main.js?45b8:272
  EventEmitter.emit @ emitter.js?927b:50
  WebSocketTransport.ws.onmessage @ websocket.js?c17e:35
  wrapFn @ zone.js?fad3:1075
  ZoneDelegate.invokeTask @ zone.js?fad3:424
  Zone.runTask @ zone.js?fad3:191
  ZoneTask.invokeTask @ zone.js?fad3:498
  invokeTask @ zone.js?fad3:1370
  globalZoneAwareCallback @ zone.js?fad3:1388
  </code></pre>
  
  <p>I imported this:</p>
  
  <pre><code>import {FroalaEditorModule} from 'ng2-froala-editor/ng2-froala-editor';
  </code></pre>
  
  <p>into module.ts and this into component</p>
  
  <pre><code>import {FroalaEditorComponent} from 'ng2-froala-editor/ng2-froala-editor';
  </code></pre>
  
  <p>Anyone know how to solve this error?</p>