FEATURE: new scheduler

Removed sidetiq, introduced new scheduler

- add basic UI
- add schedule discover
- add scheduling in initializer

lib/scheduler/schedule.rb

@@ -1,5 +1,20 @@
 module Scheduler::Schedule
   def every(duration=nil)
-    @every ||= duration
+    if duration
+      @every = duration
+      if manager = Scheduler::Manager.current
+        manager.ensure_schedule!(self)
+      end
+    end
+    @every
+  end
+
+  def schedule_info
+    manager = Scheduler::Manager.without_runner
+    manager.schedule_info self
+  end
+
+  def scheduled?
+    !!@every
   end
 end