Improve diff UI and mr compare page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/commit.scss

@@ -26,14 +26,6 @@
   margin-top: 10px;
 }
 
-.commit-stat-summary {
-  color: #666;
-  font-size: 14px;
-  font-weight: normal;
-  padding: 3px 0;
-  margin-bottom: 10px;
-}
-
 .commit-info-row {
   margin-bottom: 10px;
   .avatar {

app/assets/stylesheets/pages/diff.scss

 .diff-file {
-  border: 1px solid $border-color;
-  margin-bottom: 1em;
+  margin-left: -16px;
+  margin-right: -16px;
+  border: none;
+  border-bottom: 1px solid #E7E9EE;
 
   .diff-header {
     position: relative;
@@ -367,3 +369,7 @@
   white-space: pre-wrap;
 }
 
+.inline-parallel-buttons {
+  float: right;
+  margin-top: -5px;
+}

app/views/projects/diffs/_diffs.html.haml

 - if params[:view] == 'parallel'
   - fluid_layout true
 
-.prepend-top-20.append-bottom-20
-  .pull-right
+.gray-content-block.second-block
+  .inline-parallel-buttons
     .btn-group
       = inline_diff_btn
       = parallel_diff_btn

app/views/projects/diffs/_stats.html.haml

@@ -10,7 +10,7 @@
         and
         %strong.cred #{@commit.stats.deletions} deletions
   .file-stats.js-toggle-content.hide
-    %ul.bordered-list
+    %ul
       - diffs.each_with_index do |diff, i|
         %li
           - if diff.deleted_file

app/views/projects/merge_requests/_new_compare.html.haml

@@ -37,7 +37,7 @@
         %h4 Compare failed
         %p We can't compare selected branches. It may be because of huge diff. Please try again or select different branches.
     - else
-      .light-well
+      .light-well.append-bottom-10
         .center
           %h4
             There isn't anything to merge.

app/views/projects/merge_requests/_new_submit.html.haml

@@ -18,15 +18,13 @@
     = f.hidden_field :target_branch
 
 .mr-compare.merge-request
-  %ul.nav.nav-tabs.merge-request-tabs
+  %ul.merge-request-tabs
     %li.commits-tab
       = link_to url_for(params), data: {target: '#commits', action: 'commits', toggle: 'tab'} do
-        = icon('history')
         Commits
         %span.badge= @commits.size
     %li.diffs-tab.active
       = link_to url_for(params), data: {target: '#diffs', action: 'diffs', toggle: 'tab'} do
-        = icon('list-alt')
         Changes
         %span.badge= @diffs.size