Add option to daemonize

lib/crono/cli.rb

@@ -49,6 +49,11 @@ module Crono
         opts.on("-L", "--logfile PATH", "Path to writable logfile (Default: #{Crono.config.logfile})") do |logfile|
           Crono.config.logfile = logfile
         end
+
+        opts.on("-d", "--[no-]daemonize", "Daemonize process (Default: #{Crono.config.daemonize})") do |daemonize|
+          Crono.config.daemonize = daemonize
+        end
+        
       end.parse!(argv)
     end
   end

lib/crono/config.rb

@@ -7,11 +7,13 @@ module Crono
     attr_accessor :schedule
     attr_accessor :cronotab
     attr_accessor :logfile
+    attr_accessor :daemonize
 
     def initialize
       self.schedule = Schedule.new
       self.cronotab = CRONOTAB
       self.logfile  = LOGFILE
+      self.daemonize = false
     end
   end