Reduce N+1 queries getting holding pen requests

Removes the following bullet warning:

    N+1 Query detected
      IncomingMessage => [:raw_email]
      Add to your finder: :includes => [:raw_email]
    N+1 Query method call stack
      /home/vagrant/alaveteli/app/models/incoming_message.rb:115:in
    `parse_raw_email!'
      /home/vagrant/alaveteli/app/models/incoming_message.rb:150:in `sent_at'
      /home/vagrant/alaveteli/app/views/admin_general/index.html.erb:54:in
    `_app_views_admin_general_index_html_erb___48164640_70115534664600'
      /home/vagrant/alaveteli/app/views/admin_general/index.html.erb:42:in
    `_app_views_admin_general_index_html_erb___48164640_70115534664600'
      /home/vagrant/alaveteli/app/controllers/application_controller.rb:111:in
    `record_memory'
      /home/vagrant/alaveteli/lib/whatdotheyknow/strip_empty_sessions.rb:14:in
    `call'

Improved view rendering times:

Before: Completed 200 OK in 2813.9ms (Views: 1697.3ms | ActiveRecord: 9.5ms)
        Completed 200 OK in 2548.6ms (Views: 1838.2ms | ActiveRecord: 8.2ms)

After:  Completed 200 OK in 2185.9ms (Views: 276.0ms | ActiveRecord: 7.5ms)
        Completed 200 OK in 2216.3ms (Views: 100.3ms | ActiveRecord: 7.6ms)

0 files changed, 0 insertions, 0 deletions