linter code fixes

src/common/Class.ts

@@ -1,4 +1,4 @@
-import { copyOwnProps, hasOwnProp } from '../util'
+import { copyOwnProps } from '../util'
 
 
 // Class that all other classes will inherit from

src/common/Scroller.ts

@@ -1,3 +1,4 @@
+import * as $ from 'jquery'
 import { getScrollbarWidths } from '../util'
 import Class from '../common/Class'