Add '$mdInkRippleProvider' defs to 'angular-material'

ref: https://github.com/angular/material/blob/master/src/core/services/ripple/ripple.js#L102

types/angular-material/index.d.ts

@@ -152,6 +152,10 @@ declare module 'angular' {
             defaultViewBoxSize(viewBoxSize: number): IIconProvider; // default: 24
             defaultFontSet(name: string): IIconProvider;
         }
+    
+        interface IInkRippleProvider {
+            disableInkRipple(): void;
+        }
 
         type IMedia = (media: string) => boolean;