Merge branch 'dz-small-ui-fixes' into 'master'

Small ui fixes

- Dont use small font size for commits list    
- Use standard button size for new file
- Fix vertical align for files tab top navigation
- Add border bottom and margin for readme holder 


cc @skyruler @jschatz1 

See merge request !3419

app/assets/stylesheets/framework/files.scss

@@ -3,12 +3,10 @@
  *
  */
 .file-holder {
-  border: none;
   border: 1px solid $border-color;
   &.readme-holder {
-    margin-top: 10px;
-    border-bottom: 0;
+    margin: $gl-padding-top 0;
   }
   table {

app/assets/stylesheets/pages/commits.scss

@@ -93,7 +93,6 @@ li.commit {
   .commit-row-info {
     color: $gl-gray;
     line-height: 24px;
-    font-size: 13px;
     a {
       color: $gl-gray;

app/assets/stylesheets/pages/projects.scss

@@ -222,7 +222,7 @@
   padding: 0;
   background: transparent;
   border: none;
-  line-height: 42px;
+  line-height: 36px;
   margin: 0;
   > li + li:before {

app/views/projects/find_file/show.html.haml

@@ -2,7 +2,7 @@
 - header_title project_title(@project, "Files", project_files_path(@project))
 .file-finder-holder.tree-holder.clearfix
-  .gray-content-block.top-block
+  .nav-block
     .tree-ref-holder
       = render 'shared/ref_switcher', destination: 'find_file', path: @path
     %ul.breadcrumb.repo-breadcrumb

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

@@ -15,11 +15,11 @@
   - if current_user
     %li
       - if !on_top_of_branch?
-        %span.btn.btn-sm.add-to-tree.disabled.has-tooltip{title: "You can only add files when you are on a branch", data: { container: 'body' }}
+        %span.btn.add-to-tree.disabled.has-tooltip{title: "You can only add files when you are on a branch", data: { container: 'body' }}
           = icon('plus')
       - else
         %span.dropdown
-          %a.dropdown-toggle.btn.btn-sm.add-to-tree{href: '#', "data-toggle" => "dropdown"}
+          %a.dropdown-toggle.btn.add-to-tree{href: '#', "data-toggle" => "dropdown"}
             = icon('plus')
           %ul.dropdown-menu
             - if can_edit_tree?