Make old selectors work

Author: tinayuangao

src/lib/progress-spinner/_progress-spinner-theme.scss

@@ -7,7 +7,7 @@
   $accent: map-get($theme, accent);
   $warn: map-get($theme, warn);
 
-  md-progress-spinner, md-spinner {
+  md-progress-spinner, md-progress-circle, md-spinner {
     path {
       stroke: md-color($primary, 600);
     }

src/lib/progress-spinner/progress-spinner.ts

@@ -39,7 +39,7 @@ type EasingFn = (currentTime: number, startValue: number,
  */
 @Component({
   moduleId: module.id,
-  selector: 'md-progress-spinner, mat-progress-spinner',
+  selector: 'md-progress-spinner, mat-progress-spinner, md-progress-circle, mat-progress-circle',
   host: {
     'role': 'progressbar',
     '[attr.aria-valuemin]': '_ariaValueMin',
@@ -348,3 +348,9 @@ export class MdProgressSpinnerModule {
     };
   }
 }
+
+/** @deprecated */
+export {MdProgressSpinner as MdProgressCircle};
+
+/** @deprecated */
+export {MdProgressSpinnerModule as MdProgressCircleModule};