updated push rake task to copy contents of public directory into _deploy

Rakefile

@@ -163,7 +163,7 @@ desc "deploy public directory to github pages"
 task :push do
   puts "## Deploying branch to Github Pages "
   (Dir["#{deploy_dir}/*"]).each { |f| rm_rf(f) }
-  system "cp -R #{public_dir}/ #{deploy_dir}"
+  system "cp -R #{public_dir}/* #{deploy_dir}"
   puts "\n## copying #{public_dir} to #{deploy_dir}"
   cd "#{deploy_dir}" do
     system "git add ."