Merge branch 'ui-improvements' into 'master'

Ui improvements

* revert of wrong patch
* spall margin change

Explanation with screenshots here - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/579#note_1845510

See merge request !1117

app/assets/stylesheets/pages/merge_requests.scss

@@ -91,8 +91,6 @@
 
 @media(min-width: $screen-sm-max) {
   .merge-request .merge-request-tabs{
-    margin: 20px 0;
-
     li {
       a {
         padding: 15px 40px;
@@ -102,6 +100,11 @@
   }
 }
 
+.merge-request .merge-request-tabs{
+  margin-top: 30px;
+  margin-bottom: 20px;
+}
+
 .mr_source_commit,
 .mr_target_commit {
   .commit {

app/assets/stylesheets/pages/tree.scss

@@ -60,7 +60,11 @@
   }
 
   .tree_author {
-    padding-left: 8px;
+    padding-right: 8px;
+
+    .commit-author-name {
+      color: gray;
+    }
   }
 
   .tree_commit {

app/views/projects/tree/_tree_commit_column.html.haml

 %span.str-truncated
+  %span.tree_author= commit_author_link(commit, avatar: true, size: 16)
   = link_to_gfm commit.title, namespace_project_commit_path(@project.namespace, @project, commit.id), class: "tree-commit-link"
-  %span.tree_author
-    [
-    commit_author_link(commit, avatar: false)
-    ]