Fixed publish_doc

Rakefile

@@ -130,20 +130,16 @@ end
 
 desc "Publish doc on padrino.github.com"
 task :publish_doc do
-  begin
-    puts "Publishing doc on padrino.github.com ..."
-    rake_command("readme")
-    sh 'git clone git@github.com:padrino/padrino.github.com.git'
-    rake_command("rdoc")
-    Dir.chdir('padrino.github.com') do
-      sh 'git add *'
-      sh 'git commit -m "Updated docs."'
-      sh 'git push origin master'
-    end
-    FileUtils.rm_rf "padrino.github.com"
-  rescue Exception => e
-    puts e.message
+  puts "Publishing doc on padrino.github.com ..."
+  rake_command("readme")
+  `git clone git@github.com:padrino/padrino.github.com.git`
+  rake_command("rdoc")
+  Dir.chdir('padrino.github.com') do
+    `git add *`
+    `git commit -m "Updated docs."`
+    `git push origin master`
   end
+  FileUtils.rm_rf "padrino.github.com"
 end
 
 desc "Release all padrino gems"