Fixed failures by increasing have_at_most values

  1) advanced search pub info subject 'soviet union and historiography' and pub info '1910-1911 pub info 2010
     Failure/Error: resp.should have_at_most(137550).results
       expected at most 137550 results, got 137556
     # ./spec/advanced_search_spec.rb:340:in `block (4 levels) in <top (required)>'

  2) advanced search pub info subject 'soviet union and historiography' and pub info '1910-1911 pub info 2011
     Failure/Error: resp.should have_at_most(126800).results
       expected at most 126800 results, got 126917
     # ./spec/advanced_search_spec.rb:345:in `block (4 levels) in <top (required)>'