remove unnecessary decorations

app/views/graph/show.json.erb

@@ -7,9 +7,9 @@
       {
         parents: parents_zip_spaces(c.parents(@graph.map), c.parent_spaces),
         author: {
-          name: c.author.name,
-          email: c.author.email,
-          icon: gravatar_icon(c.author.email, 20)
+          name: c.author_name,
+          email: c.author_email,
+          icon: gravatar_icon(c.author_email, 20)
         },
         time: c.time,
         space: c.spaces.first,

lib/gitlab/git/compare.rb

@@ -20,10 +20,8 @@ module Gitlab
           return
         end
-        @commit = Commit.new(first)
-
+        @commit = first
         @commits = repository.commits_between(last.id, first.id)
-        @commits = @commits.map { |c| Commit.new(c) }
         @diffs = if @commits.size > 100
                    []