Updated CLI and Config to default to not writing a pidfile unless daemonized.

lib/crono/cli.rb

@@ -50,6 +50,7 @@ module Crono
     end
 
     def write_pid
+      return unless config.pidfile
       pidfile = File.expand_path(config.pidfile)
       File.write(pidfile, ::Process.pid)
     end

lib/crono/config.rb

@@ -10,9 +10,12 @@ module Crono
     def initialize
       self.cronotab = CRONOTAB
       self.logfile  = LOGFILE
-      self.pidfile  = PIDFILE
       self.daemonize = false
       self.environment = ENV['RAILS_ENV'] || ENV['RACK_ENV'] || 'development'
     end
+
+    def pidfile
+      @pidfile || (daemonize ? PIDFILE : nil)
+    end
   end
 end