Merge branch 'master' into joindep

* master: (44 commits)
  grammar fix (reverted in e9a1ecd)
  Revert "fixed a doc bug in the CHANGELOG.md s/does no longer depend on/no longer depends on/"
  Add missed require making `enable_warnings` available
  Prepare generated Gemfile for Capistrano 3
  Added --model-name option scaffold_controller_generator.
  read the association instead of sending
  we should have unique sponsorable ids in the fixtures at least
  simplify populating the ordering hash
  the preloader for the RHS has all the preloaded records, so ask it
  only calculate offset index once. #12537
  Remove size alias for length validation
  Fix `singleton_class?`
  Minor Refactoring to `NumberHelper#number_to_human`
  `$SAFE = 4;` has been removed with Ruby 2.1
  scope_chain should not be mutated for other reflections
  Remove `default_primary_key_type`  and extract contains of `native_database_types` to a constant since they aren't conditional now in SQLite3Adapter. Makes it more like other adapters.
  cleanup changelog entry format. [ci skip]
  Extract a function to determine if the default value is a function
  Push default_function to superclass to avoid method check
  Dump the default function when the primary key is uuid
  ...

Conflicts:
	activerecord/lib/active_record/relation/finder_methods.rb

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