Merge branch 'commit-avatar-alignment' into 'master'

Fixed comit avatar alignment

## What does this MR do?

Fixes the alignment of the avatar on https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG

Also fixes potential issues in other places.

## Screenshots (if relevant)

![Screen_Shot_2016-06-27_at_10.58.26](/uploads/fa4f50cfc30a870422d1afa63a4331d1/Screen_Shot_2016-06-27_at_10.58.26.png)![Screen_Shot_2016-06-27_at_10.58.35](/uploads/bd7dc3cf77464c1775fabb45b8079f02/Screen_Shot_2016-06-27_at_10.58.35.png)

See merge request !4933

app/assets/stylesheets/pages/commits.scss

@@ -83,11 +83,7 @@
   position: relative;
 
   @media (min-width: $screen-sm-min) {
-    padding-left: 20px;
-
-    .commit-info-block {
-      padding-left: 44px;
-    }
+    padding-left: 46px;
   }
 
   &:not(:last-child) {
@@ -102,9 +98,7 @@
 
 
   .avatar {
-    position: absolute;
-    top: 10px;
-    left: 16px;
+    margin-left: -46px;
   }
 
   .item-title {

app/assets/stylesheets/pages/tree.scss

@@ -101,7 +101,8 @@
   margin: 0;
 
   .commit {
-    padding: 0 0 0 55px;
+    padding-top: 0;
+    padding-bottom: 0;
 
     .commit-row-title {
       .commit-row-message {