Rename Object#self to Object#itself to have parity with matz sanctioned method name for Ruby 2.2
Rename tests too
always return a string from find_script_name

this allows us to avoid nil checks on the return value
just set the host, no need for another hash allocation / merge!
Improve the error message when resque-scheduler is not available
Fix the test requirement of resque_scheduler
copy edits[ci skip]
Merge branch 'master' of github.com:rails/docrails

Conflicts:
	guides/source/testing.md
Deprecate source_macro

`source_macro` is no longer used in any ActiveRecord code. I've
chosen to deprecate it because it was not marked as nodoc and may
be in use outside of rails source.
rename MiniTest to Minitest
Merge pull request #16373 from eileencodes/deprecate-reflection-source_macro

Deprecate source_macro
Merge pull request #16374 from rajcybage/consistency_minitest

rename MiniTest to Minitest
[ci skip] fix markdown
Add an after_bundle callback in Rails templates

The template runs before the generation of binstubs – this does not
allow to write one, that makes an initial commit to version control.
It is solvable by adding an after_bundle callback.
Merge pull request #16377 from JackDanger/doc-fix-in-association-reflection

Fixes small error in ActiveRecord::Reflection docs
updating documented parameter for build_constraint

Updates documentation in line with changes made in
743b67508e2027e1d086142ccbec47a19fc943f6
Merge pull request #16378 from JackDanger/doc-fix-in-join-association-build_constraint

[doc] updating documented parameter for build_constraint
[ci skip] Remove "Machinist" from testing guide
Merge pull request #16380 from y-yagi/patch-1

[ci skip] Remove "Machinist" from testing guide
[ci skip] add tip for uglifier in execjs error