bring back "current" classname to current page

Listening to @kneath in 8c585a7

lib/will_paginate/view_helpers/link_renderer.rb

@@ -44,7 +44,7 @@ def page_number(page)
         unless page == current_page
           link(page, page, :rel => rel_value(page))
         else
-          tag(:em, page)
+          tag(:em, page, :class => 'current')
         end
       end
 

spec/view_helpers/action_view_spec.rb

@@ -50,7 +50,7 @@ def render(locals)
       end
       assert_select 'span', 1
       assert_select 'span.disabled:first-child', '← Previous'
-      assert_select 'em', '1'
+      assert_select 'em.current', '1'
       pagination.first.inner_text.should == '← Previous 1 2 3 Next →'
     end
   end
@@ -74,7 +74,7 @@ def render(locals)
           link.first['rel'].should == 'next'
         end
       end
-      assert_select 'em', '2'
+      assert_select '.current', '2'
     end
   end
 
@@ -109,7 +109,7 @@ def renderer.gap() '<span class="my-gap">~~</span>' end
     paginate
     expected = <<-HTML
       <div class="pagination"><span class="previous_page disabled">&#8592; Previous</span>
-      <em>1</em>
+      <em class="current">1</em>
       <a href="/foo/bar?page=2" rel="next">2</a>
       <a href="/foo/bar?page=3">3</a>
       <a href="/foo/bar?page=2" class="next_page" rel="next">Next &#8594;</a></div>