Refactor to remove global variables

spec/config_spec.rb

@@ -3,8 +3,10 @@ require "spec_helper"
 describe Crono::Config do
   describe "#initialize" do
     it "should initialize schedule" do
-      @config = Crono.config
-      expect(@config.schedule).to be_a(Crono::Schedule)
+      @config = Crono::Config.new
+      expect(@config.cronotab).to be Crono::Config::CRONOTAB
+      expect(@config.logfile).to be Crono::Config::LOGFILE
+      expect(@config.daemonize).to be false
     end
   end
 end