#11759: Update Assets Pipeline Guide

by default included to precompile only non-js/css files from `app/assets` and `application.(css|js)`
adding a weird test case
Add CHANGELOG entry for #11767

[ci skip]
asakusa.rb hack night!

Fix in-memory tests
Fix indentation
Use the proper encoding comment on the file
Add a missing require.

This makes the rack_logger_test.rb runnable by itself (outside of the `rake test` suite).
"Naked" rescue clauses only catch StandardError subclasses.

Similar to #11497.
test to express that we can't turn non-array columns to array columns.

Closes #11062
includes with persistent select
change select to be db safe
change select to be db safe