Add responsiveness for footer. Update gulpjs, package.json and bootstrap sass

static/assets/bootstrap/sass/mixins/_table-row.sass

@@ -0,0 +1,23 @@
+// Tables
+
+=table-row-variant($state, $background)
+  // Exact selectors below required to override `.table-striped` and prevent
+  // inheritance to nested tables.
+  .table-#{$state}
+    &,
+    > th,
+    > td
+      background-color: $background
+
+  // Hover states for `.table-hover`
+  // Note: this is not available for cells or rows within `thead` or `tfoot`.
+  .table-hover
+    $hover-background: darken($background, 5%)
+
+    .table-#{$state}
+      +hover
+        background-color: $hover-background
+
+        > td,
+        > th
+          background-color: $hover-background