Make railties version match RAILS_VERSION
Merge pull request #10405 from rubys/410-beta

Make railties version match RAILS_VERSION
allow override of uuid_generate_v4() default by passing default: nil

without this, it's not possible to use UUID primary keys without uuid-ossp installed and activated
Merge pull request #10404 from chadmoone/fix-pg-uuid-default

Allow override of PostgreSQL UUID primary key default
use constant for encoding
Merge pull request #10407 from NARKOZ/encoding-constant

Use constant for encoding
Improve docs for postgresql with uuid primary keys [ci skip]

Introduced in 09ac1776abc0d3482f491f2d49f47bcb3d9a4ad7.
Merge branch 'master' of git://github.com/rails/rails