Initial Bootstrap 3 migration

src/UI/Content/Bootstrap/grid.less

@@ -3,19 +3,82 @@
 // --------------------------------------------------
 
 
-// Fixed (940px)
-#grid > .core(@gridColumnWidth, @gridGutterWidth);
+// Container widths
+//
+// Set the container width, and override it for fixed navbars in media queries.
 
-// Fluid (940px)
-#grid > .fluid(@fluidGridColumnWidth, @fluidGridGutterWidth);
+.container {
+  .container-fixed();
 
-// Reset utility classes due to specificity
-[class*="span"].hide,
-.row-fluid [class*="span"].hide {
-  display: none;
+  @media (min-width: @screen-sm-min) {
+    width: @container-sm;
+  }
+  @media (min-width: @screen-md-min) {
+    width: @container-md;
+  }
+  @media (min-width: @screen-lg-min) {
+    width: @container-lg;
+  }
 }
 
-[class*="span"].pull-right,
-.row-fluid [class*="span"].pull-right {
-  float: right;
+
+// Fluid container
+//
+// Utilizes the mixin meant for fixed width containers, but without any defined
+// width for fluid, full width layouts.
+
+.container-fluid {
+  .container-fixed();
+}
+
+
+// Row
+//
+// Rows contain and clear the floats of your columns.
+
+.row {
+  .make-row();
+}
+
+
+// Columns
+//
+// Common styles for small and large grid columns
+
+.make-grid-columns();
+
+
+// Extra small grid
+//
+// Columns, offsets, pushes, and pulls for extra small devices like
+// smartphones.
+
+.make-grid(xs);
+
+
+// Small grid
+//
+// Columns, offsets, pushes, and pulls for the small device range, from phones
+// to tablets.
+
+@media (min-width: @screen-sm-min) {
+  .make-grid(sm);
+}
+
+
+// Medium grid
+//
+// Columns, offsets, pushes, and pulls for the desktop device range.
+
+@media (min-width: @screen-md-min) {
+  .make-grid(md);
+}
+
+
+// Large grid
+//
+// Columns, offsets, pushes, and pulls for the large desktop device range.
+
+@media (min-width: @screen-lg-min) {
+  .make-grid(lg);
 }