Added progres-circle file

Author: tinayuangao

src/lib/progress-spinner/index.ts

@@ -1 +1,2 @@
+export * from './progress-circle';
 export * from './progress-spinner';

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

@@ -0,0 +1,4 @@
+/** @deprecated */
+export {MdProgressSpinner as MdProgressCircle} from './progress-spinner';
+/** @deprecated */
+export {MdProgressSpinnerModule as MdProgressCircleModule} from './progress-spinner';

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

@@ -348,9 +348,3 @@ export class MdProgressSpinnerModule {
     };
   }
 }
-
-/** @deprecated */
-export {MdProgressSpinner as MdProgressCircle};
-
-/** @deprecated */
-export {MdProgressSpinnerModule as MdProgressCircleModule};