Update home stats summary CSS

The construct_homepage_summary_items hook allows to add items, but if
you use exactly the same markup as wagtail you end up with a bad layout
because the items form rows with no whitespace between them.

This commit changes the padding-bottom of the section into a margin-bottom
of it's <li> items, meaning that they form rows with enough whitespace
in between them, and the whitespace at the bottom is preserved.

CHANGELOG.txt

@@ -23,6 +23,7 @@ Changelog
  * The `edit bird` on the frontend has been redesigned, and no longer depends on an iframe (Thomas Winter, Gareth Price).
  * New translations for Hungarian, Swedish (Sweden) and Turkish
  * Upgraded jQuery to 2.2.1 (Charlie Choiniere)
+ * Multiple homepage summary items (`construct_homepage_summary_items` hook) now better vertically spaced (Nicolas Kuttler)
  * Fix: Custom page managers no longer raise an error when used on an abstract model
  * Fix: Wagtail's migrations are now all reversible (benjaoming)
  * Fix: Deleting a page content type now preserves existing pages as basic Page instances, to prevent tree corruption

CONTRIBUTORS.rst

@@ -110,6 +110,7 @@ Contributors
 * Thomas Winter
 * Gareth Price
 * Liam Brenner
+* Nicolas Kuttler
 
 Translators
 ===========

docs/releases/1.4.rst

@@ -61,6 +61,7 @@ Minor features
  * The ``Page`` model now has two new methods ``get_site()`` and ``get_url_parts()`` to aid with customising the page URL generation logic
  * New translations for Hungarian, Swedish (Sweden) and Turkish
  * Upgraded jQuery to 2.2.1 (Charlie Choiniere)
+ * Multiple homepage summary items (`construct_homepage_summary_items` hook) now better vertically spaced (Nicolas Kuttler)
 
 
 Bug fixes

wagtail/wagtailadmin/static_src/wagtailadmin/scss/layouts/home.scss

@@ -33,7 +33,6 @@ header {
     background-color: $color-grey-5;
     margin-bottom: 2em;
     padding-top: 2em;
-    padding-bottom: 2em;
 
     ul.stats {
         @include clearfix();
@@ -42,6 +41,7 @@ header {
 
         li {
             @include column(4);
+            margin-bottom: 2em;
 
             &:before {
                 opacity: 0.2;