Configure log_level from within configuration block

[TheNotary]

Looks like when the logging system was upgraded, the ability to set the default log level was lost. It would be handy to be able to set the default log level (if you wanted it to be quiet for instance, to :fatal) from within the configuration block.

test_master_bot = Cinch::Bot.new do
    configure do |c|
      c.nick = "testc"
      c.server = "127.0.0.1"
      c.channels = [ENV['irc_channel']]
      # c.verbose = false # lost
      c.log_level = :fatal
    end
  end

[bougyman]

The PR for this will be tested today.