Resolve test name conflict

sanitize_name in contest.rb strips out any non-word characters, so
'is false for status > 404' and 'is false for status < 404' end up as
having the same test name, causing lost tests.

Rename these tests to use 'gt' and 'lt' rather then '>' and '<'.

test/helpers_test.rb

@@ -31,12 +31,12 @@ class HelpersTest < Test::Unit::TestCase
       assert_body 'true'
     end
 
-    it 'is false for status > 404' do
+    it 'is false for status gt 404' do
       status_app(405) { not_found? }
       assert_body 'false'
     end
 
-    it 'is false for status < 404' do
+    it 'is false for status lt 404' do
       status_app(403) { not_found? }
       assert_body 'false'
     end