TdLoadingService. Add property background (true, false) in method create.

[MOTORIST]

export interface ITdLoadingConfig {
    name: string;
    type?: LoadingType;
    mode?: LoadingMode;
    color?: 'primary' | 'accent' | 'warn';
    background: boolean
}

private _initPreloader(): void {
    this._preloader.create({
      name: 'preload',
      mode: LoadingMode.Indeterminate,
      type: LoadingType.Linear,
      background: false, // show / hide background
    });
 }

[emoralesb05]

Is there a reason for this enhancement? Just trying to get more context of the use case

[MOTORIST]

How to make preloader (linear) as github.com? Github have a preloader without a background.