Ignore .bundle/ and vendor/.
Add centos63 support.

Merge from 3bcd1f15927ecb76dffdafc6f21f1f2f93c54f8e to 708e727387d86e48390bff85db1dffd018eaa742
on feature/support-cent63 branch.
No email notification if node[:monit][:notify_email] is nil.