Allows setting of false boolean options

[zatomik]

For eg the default autoUpload: boolean = true;

then adding option in component to false

  options: Object = {
    url: 'http://localhost:10050/upload',
    autoUpload: false
  };

In the service will always return the default again (true) so replacing:

this.autoUpload = options && options.autoUpload || this.autoUpload;

with

this.autoUpload = options.autoUpload != null ? options.autoUpload : this.autoUpload;

[jkuri]

Hi @zatomik, thanks for the fix!