Fix undefined local variable or method `klass_name' for Resque::Scheduler:Class
Allowing for conditional disabling of test redis server

so that we don't error out on Travis due to redis server shutdown
issues, for example, as happened for #309.

Conflicts:
	test/support/redis_instance.rb
	test/test_helper.rb
Backporting the test redis instance stuff to v1.9-stable
Merge pull request #317 from meatballhat/radsaq-fix_klass_name_error

Radsaq fix klass name error
Merge remote-tracking branch 'upstream/v1.9-stable' into merging-v1.9-stable

Conflicts:
	lib/resque/scheduler.rb
	test/delayed_queue_test.rb
	test/support/redis_instance.rb
	test/test_helper.rb
Merge pull request #319 from meatballhat/merging-v1.9-stable

Merging v1.9 stable