Revert "updating i18n guide with locale config location."

This reverts commit 46902908910c041e268429d674bbe084399cc664.
Revert "Set the default timezone after the initialization since the configuration"

This reverts commit 39374aa925a7d670b039c0c0c9aa9f4aef19466b.
Revert "Merge pull request #7873 from steveklabnik/update_initializer"

This reverts commit 43e14f8ff203c21646f733d35bdde4e68da70a3b, reversing
changes made to bb17a0f085aba40a1952612f6c98b2a5804a1152.

Conflicts:
	railties/lib/rails/generators/rails/app/templates/config/application.rb
	railties/lib/rails/generators/rails/app/templates/config/initializers/locale.rb

Reason: setting the Time.zone in an after_initialize block can become a
problem for people upgrading, since it's not going to be available when
config/initializers run, and people might be relying on it.

An example that I noticed was with the Chronic gem, for date/time parsing.
It requires us to configure the time class to be Time.zone, and doing
that in an initializer no longer worked with these changes, so reverting
is the safer path for now.
Merge pull request #9027 from carlosantoniodasilva/revert-locale

Revert locale
Add failing test case for #8460

Add a test case to ensure that fractional second updates are detected.
Revert "Round usec when writing timestamp attribute."

This reverts commit e9d2ad395ec2ef929d74752f3d71c80674044fbe.

Closes #8460

Conflicts:
	activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
	activerecord/test/cases/dirty_test.rb
Less strict activerecord-deprecated_finders version