Clearfix on well-lists. Pages affected:

Pages affected:
- admin/groups#show
- admin/projets#index
- admin/users#index
- dashboard/issues#index (on small screens)

app/assets/stylesheets/generic/lists.scss

@@ -13,6 +13,12 @@
     border-bottom: 1px solid #eee;
     border-bottom: 1px solid rgba(0, 0, 0, 0.05);
+    &:after {
+      content: " ";
+      display: table;
+      clear: both;
+    }
+
     &.disabled {
       color: #888;
     }