add new grid

Author: kenold

src/styles/grid.scss

@@ -8,6 +8,9 @@
 .show-1-3 {
     flex-basis: 100%;
 }
+.show-1-4 {
+    flex-basis: 100%;
+}
 .show-2-4 {
     flex: 0 1 calc(50% - .5rem);
 }
@@ -19,6 +22,9 @@
     .show-1-3 {
         flex: 0 1 calc(33% - .75rem);
     }
+    .show-1-4 {
+        flex: 0 1 calc(25% - .75rem);
+    }
     .show-2-4 {
         flex: 0 1 calc(25% - .75rem);
     }