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

static/assets/bootstrap/sass/_code.sass

@@ -0,0 +1,43 @@
+// Inline code
+code
+  font-size: $code-font-size
+  color: $code-color
+  word-break: break-word
+
+  // Streamline the style when inside anchors to avoid broken underline and more
+  a > &
+    color: inherit
+
+// User input typically entered via keyboard
+kbd
+  padding: $kbd-padding-y $kbd-padding-x
+  font-size: $kbd-font-size
+  color: $kbd-color
+  background-color: $kbd-bg
+
+  +border-radius($border-radius-sm)
+  +box-shadow($kbd-box-shadow)
+
+  kbd
+    padding: 0
+    font-size: 100%
+    font-weight: $nested-kbd-font-weight
+
+    +box-shadow(none)
+
+// Blocks of code
+pre
+  display: block
+  font-size: $code-font-size
+  color: $pre-color
+
+  // Account for some code outputs that place code tags in pre tags
+  code
+    font-size: inherit
+    color: inherit
+    word-break: normal
+
+// Enable scrollable blocks of code
+.pre-scrollable
+  max-height: $pre-scrollable-max-height
+  overflow-y: scroll