Added original Magazine template for reference.

original-template/sass/bootstrap/_mixins.scss

@@ -0,0 +1,40 @@
+// Mixins
+// --------------------------------------------------
+
+// Utilities
+@import "mixins/hide-text";
+@import "mixins/opacity";
+@import "mixins/image";
+@import "mixins/labels";
+@import "mixins/reset-filter";
+@import "mixins/resize";
+@import "mixins/responsive-visibility";
+@import "mixins/size";
+@import "mixins/tab-focus";
+@import "mixins/reset-text";
+@import "mixins/text-emphasis";
+@import "mixins/text-overflow";
+@import "mixins/vendor-prefixes";
+
+// Components
+@import "mixins/alerts";
+@import "mixins/buttons";
+@import "mixins/panels";
+@import "mixins/pagination";
+@import "mixins/list-group";
+@import "mixins/nav-divider";
+@import "mixins/forms";
+@import "mixins/progress-bar";
+@import "mixins/table-row";
+
+// Skins
+@import "mixins/background-variant";
+@import "mixins/border-radius";
+@import "mixins/gradients";
+
+// Layout
+@import "mixins/clearfix";
+@import "mixins/center-block";
+@import "mixins/nav-vertical-align";
+@import "mixins/grid-framework";
+@import "mixins/grid";