Add configurable current_user method (#7)

Author: chaadow

app/controllers/clockwork_web/home_controller.rb

@@ -32,7 +32,7 @@ def job
       else
         ClockworkWeb.disable(job)
       end
-      ClockworkWeb.on_job_update.call(job: job, enable: enable, user: try(:current_user)) if ClockworkWeb.on_job_update
+      ClockworkWeb.on_job_update.call(job: job, enable: enable, user: try(ClockworkWeb.user_method)) if ClockworkWeb.on_job_update
       redirect_to root_path
     end
   end

lib/clockwork_web.rb

@@ -18,9 +18,11 @@ class << self
     attr_accessor :monitor
     attr_accessor :running_threshold
     attr_accessor :on_job_update
+    attr_accessor :user_method
   end
   self.monitor = true
   self.running_threshold = 60 # seconds
+  self.user_method = :current_user
 
   def self.enable(job)
     if redis