title: angular-croppie-module fail to import @type/croppie properly
body: <p>I'm new to angular 5 and struggling to implement angular-croppie-module in my app.
  I tried to have some answer on the module github but without success.
  It seems that croppie.directive.d.ts only manage to import the 'Croppie' namespace but not the class.
  As a result once I reach the page with the module I get</p>
  
  <blockquote>
    <p>ERROR TypeError: __WEBPACK_IMPORTED_MODULE_1_croppie___default.a is not a constructor</p>
  </blockquote>
  
  <p>I created a github repo to show a simple demo of the problem
  <a href="https://github.com/ErwinSanquer/croppie-demo" rel="nofollow noreferrer">https://github.com/ErwinSanquer/croppie-demo</a></p>
  
  <p>Thanks,</p>