[WIP] Refactor: easybib_crontab

[till]

• moved cron parsing logic into a library
• exit early from provider code to avoid large if/else
• todo:
  • test (this is just a WIP)
  • discuss this approach
  • consider introducing EasyBib::Cron::Entry
  • add a test to confirm parsing works as expected

[till]

I think I would take this even further and add:

module EasyBib
  module Cron
    module Entry
      def hour, minute, day, month, weekday, command
    end
  end
end

What do you think?

[till]

@fh Let me know what you think, one thing I cannot figure out right now is a loading issue. The class is not found in the provider, but this seems to work otherwise.

[fh]

This one works for me, at least the tests seem to be fine. Feel free to merge when you are satisfied, too :)

[till]

@fh last test will break the build, let me know if you can check it out.

[fh]

@till Just did, see xmpp :)