Put wiki page history content into container

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

app/views/projects/wikis/history.html.haml

 - page_title "History", @page.title.capitalize, "Wiki"
 = render 'nav'
-.top-area
-  .nav-text
-    %strong
-      = link_to @page.title.capitalize, namespace_project_wiki_path(@project.namespace, @project, @page)
-    %span.light
-      ·
-      History
-
-.table-holder
-  %table.table
-    %thead
-      %tr
-        %th Page version
-        %th Author
-        %th Commit Message
-        %th Last updated
-        %th Format
-    %tbody
-      - @page.versions.each_with_index do |version, index|
-        - commit = version
+%div{ class: (container_class) }
+  .top-area
+    .nav-text
+      %strong
+        = link_to @page.title.capitalize, namespace_project_wiki_path(@project.namespace, @project, @page)
+      %span.light
+        ·
+        History
+  .table-holder
+    %table.table
+      %thead
         %tr
-          %td
-            = link_to project_wiki_path_with_version(@project, @page,
-                                                     commit.id, index == 0) do
-              = truncate_sha(commit.id)
-          %td
-            = commit.author.name
-          %td
-            = commit.message
-          %td
-            #{time_ago_with_tooltip(version.authored_date)}
-          %td
-            %strong
-              = @page.page.wiki.page(@page.page.name, commit.id).try(:format)
+          %th Page version
+          %th Author
+          %th Commit Message
+          %th Last updated
+          %th Format
+      %tbody
+        - @page.versions.each_with_index do |version, index|
+          - commit = version
+          %tr
+            %td
+              = link_to project_wiki_path_with_version(@project, @page,
+                                                       commit.id, index == 0) do
+                = truncate_sha(commit.id)
+            %td
+              = commit.author.name
+            %td
+              = commit.message
+            %td
+              #{time_ago_with_tooltip(version.authored_date)}
+            %td
+              %strong
+                = @page.page.wiki.page(@page.page.name, commit.id).try(:format)