Merge pull request #583 from xuhdev/deploy-nojekyll

Use a more portable way to create .nojekyll file when deploying to github pages.

Rakefile

@@ -295,7 +295,7 @@ multitask :push do
     puts "\n## copying #{public_dir} to #{deploy_dir}"
     cp_r "#{public_dir}/.", deploy_dir
     cd "#{deploy_dir}" do
-      system "touch .nojekyll"
+      File.new(".nojekyll", "w").close
       system "git add ."
       system "git add -u"
       message = "Site updated at #{Time.now.utc}"