We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
DEPRECATION WARNING: ActiveModel::Errors#[]= is deprecated and will be
removed in Rails 5.1. Use model.errors.add(:attachment, "content type
image/png does not match any of accepted content types pdf") instead.
(called from validate_attachment_content_type at
/home/travis/build/consul/consul/app/models/document.rb:92)
