Don't include URL helpers at the top level.

This caused the test suite to fail at the initialization phase with ruby 1.9.3
and test-unit 3.0.9. It was fine with other combinations. The fix reflects best
practice.

test/test_helper.rb

@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------
-# Copyright (c) 2013, 2014 The University of Manchester, UK.
+# Copyright (c) 2013-2015 The University of Manchester, UK.
 #
 # BSD Licenced. See LICENCE.rdoc for details.
 #
@@ -30,7 +30,6 @@
 end
 
 class ActiveSupport::TestCase
-  include TavernaPlayer::Engine.routes.url_helpers
   include ActionDispatch::TestProcess
   fixtures :all
 end

test/unit/helpers/taverna_player/runs_helper_test.rb

@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------
-# Copyright (c) 2013, 2014 The University of Manchester, UK.
+# Copyright (c) 2013-2015 The University of Manchester, UK.
 #
 # BSD Licenced. See LICENCE.rdoc for details.
 #
@@ -14,6 +14,8 @@
 
 module TavernaPlayer
   class RunsHelperTest < ActionView::TestCase
+    include TavernaPlayer::Engine.routes.url_helpers
+
     setup do
       @int1 = taverna_player_interactions(:one)
       @int2 = taverna_player_interactions(:two)