fix(progressbar): fix bs4, animation, add striped option, remove bs4 demos (#3500)

* fix(progressbar): fix empty bs4 bar, add striped option, remove unnecessary DOM nesting

* fix(progressbar): fix animation, remove ProgressDirective, remove bs4 demos, simplify html

Author: IlyaSurmay

demo/src/app/components/+progressbar/demos/bs3/static/static.html

@@ -4,7 +4,7 @@ import { ProgressbarConfig } from 'ngx-bootstrap/progressbar';
 // such override allows to keep some initial values
 
 export function getProgressbarConfig(): ProgressbarConfig {
-  return Object.assign(new ProgressbarConfig(), { animate: false, max: 150 });
+  return Object.assign(new ProgressbarConfig(), { animate: true, striped: true,  max: 150 });
 }
 
 @Component({

demo/src/app/components/+progressbar/demos/bs4/dynamic/dynamic.html

@@ -6,8 +6,6 @@
 <progressbar [animate]="false" [value]="dynamic" type="success"><b>{{dynamic}}%</b></progressbar>
 
 <small><em>Object (changes type based on value)</em></small>
-<progressbar class="progress-striped active" [value]="dynamic" [type]="type">
-  {{type}} <i *ngIf="showWarning">!!!Watch out !!!</i>
-</progressbar>
+<progressbar class="progress-striped active" [value]="dynamic" [type]="type">{{type}}</progressbar>
 
 <button type="button" class="btn btn-sm btn-primary" (click)="random()">Randomize</button>