FEATURE: add a simple queue Scheduler::Defer.later {}

For quick jobs that do not need to be sent to sidekiq,
runs inline in a single thread but does not block

spec/components/scheduler/defer_spec.rb

@@ -0,0 +1,40 @@
+# encoding: utf-8
+require 'spec_helper'
+require 'scheduler/scheduler'
+
+describe Scheduler::Defer do
+  class DeferInstance
+    include Scheduler::Deferrable
+  end
+
+  def wait_for(timeout, &blk)
+    till = Time.now + (timeout.to_f / 1000)
+    while Time.now < till && !blk.call
+      sleep 0.001
+    end
+  end
+
+  before do
+    @defer = DeferInstance.new
+    @defer.async = true
+  end
+
+  after do
+    @defer.stop!
+  end
+
+  it "can queue jobs properly" do
+    s = nil
+
+    @defer.later do
+      s = "good"
+    end
+
+    wait_for(10) do
+      s == "good"
+    end
+
+    s.should == "good"
+  end
+
+end