Merge branch 'kimth/mark-graded' of https://github.com/MITx/mitx into kimth/mark-graded

lms/static/sass/course/courseware/_sidebar.scss

@@ -180,6 +180,18 @@ section.course-index {
             font-weight: normal;
           }
         }
+
+        &.graded {
+         > a {
+           background-image: url('../images/graded.png');
+           background-repeat: no-repeat;
+           background-position: 97% center;
+          }
+
+          &.active > a {
+            @include background-image(url('../images/graded.png'), linear-gradient(top, #e6e6e6, #d6d6d6));
+          }
+        }
       }
     }
   }