Tests adjustments for girl_friday

spec/controllers/api/asciicasts_controller_spec.rb

@@ -17,7 +17,7 @@ describe Api::AsciicastsController do
       end
 
       it 'enqueues snapshot capture' do
-        SnapshotWorker.should_receive(:perform_async).with(asciicast.id)
+        SNAPSHOT_QUEUE.should_receive(:<<).with(asciicast.id)
 
         post :create
       end

spec/spec_helper.rb

@@ -20,3 +20,5 @@ RSpec.configure do |config|
 
   config.infer_base_class_for_anonymous_controllers = false
 end
+
+GirlFriday::Queue.immediate!