Fix deploy on DigitalOcean VPSes

I'm not sure exactly what the types_hash_max_size does but you have to increase it on a DigitalOcean VPS. See https://stackoverflow.com/questions/19238122/nginx-with-ubuntu-and-rails-on-digital-ocean . I'm actually not sure how DO-specific this is, but having the option to set that setting shouldn't hurt :~)

Fixed render warnings in several templates.

Fixed a typo in the README.