Implements streaming CSVs.

Allows unlimited downloads of CSV data using ActiveRecord batch APIs and ActionController response streaming.

Works on Rails 3.2+
Actually pass the options to generate_line.
Make the meat and potatoes of streaming protected.
Add no-cache header to streaming CSV responses.
Disable downstream response buffering of stream
support ransack short matchers
remove double if
Merge pull request #3144 from timoschilling/rm_doubled_if

remove double if
Merge pull request #3141 from timoschilling/support_short_predicates

support ransack short matchers
use the `permit_params` DSL everywhere
#3147: raise error for those still using `default_actions`
fix `permit_params` for renamed resources

specifically, this fixes the tests for AA::Comment
:nail_care:
remove Rails 3.1 ActiveModel::Name compatibility layer
Use latest cucumber-rails release
give optional deps in Gemfile their own section
don't specify a version for Devise in the Gemfile
#3005 appears to be resolved!

…though we have to specify a version for sass-rails (#3093)
update sass-rails requirement to work with Rails 3

#3005, #3093
test Ruby 2.1.2