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

static/assets/bootstrap/sass/mixins/_reset-text.sass

@@ -0,0 +1,21 @@
+=reset-text
+  font-family: $font-family-base
+
+  // We deliberately do NOT reset font-size or word-wrap.
+  font-style: normal
+  font-weight: $font-weight-normal
+  line-height: $line-height-base
+  text-align: left
+
+  // Fallback for where `start` is not supported
+  text-align: start
+
+  // stylelint-disable-line declaration-block-no-duplicate-properties
+  text-decoration: none
+  text-shadow: none
+  text-transform: none
+  letter-spacing: normal
+  word-break: normal
+  word-spacing: normal
+  white-space: normal
+  line-break: auto