Use project with namespace in email subject

lib/gitlab/graph/json_builder.rb

@@ -17,14 +17,14 @@ module Gitlab
         @commits = collect_commits
         @days = index_commits
       end
-      
+
       def to_json(*args)
         {
           days: @days.compact.map { |d| [d.day, d.strftime("%b")] },
           commits: @commits.map(&:to_graph_hash)
         }.to_json(*args)
       end
-    
+
     protected
 
       # Get commits from repository