removes /i from the TRUSTED_PROXIES regexp, adds /x and comments for readability, adds a pointer to a Wikipedia section that documents the matched IPs

Useful for cases such as warden, where a block configuration is taken.

    class SomeController < ApplicationController
      use RailsWarden::Manager do |manager|
        manager.default_strategies :facebook_oauth
        manager.failure_app = SomeController.action(:authorize)
      end
    end

Signed-off-by: NMikel Lindsaar <raasdnil@gmail.com>

Signed-off-by: NMikel Lindsaar <raasdnil@gmail.com>

Partial revert of commit #7fae0aa4 removing action_dispatch.prepare_dispatcher per commit #48bf667a

See line note:
http://github.com/rails/rails/commit/7fae0aa4ac116bcbf522a9a4f19972c653d366fa#commitcomment-145148

revises implementation and documentation of csrf_meta_tags, and aliases csrf_meta_tag to it for backwards compatibilty

[#5610 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NMikel Lindsaar <raasdnil@gmail.com>

added a test for relation which checks intersection between a relation and an array works in both directions
Signed-off-by: NMikel Lindsaar <raasdnil@gmail.com>

Cheaper attribute reads and respond_to?. Add underscore-prefixed method aliased to the attribute name so it can be overridden but still called internally.

if operation is count then column_name will never be blank