Updated guides with latest method [ci skip]

for blank?
fixed file name references [ci skip]
Updated guides with latest method [ci skip]
Removed doc of removed method diff [ci skip]
Fix the SQLite gem name
Add packages list for ArchLinux [ci skip]

Add the packages required on Arch Linux when setting up the development
dependencies
grab executable from rubygems
Fix order dependent AP test

any_instance.stubs + unstub with Mocha doesn't restore the original status in the following case,
so we need to undef Customer#to_json before every test

require 'test/unit'
require 'mocha/setup'

module M
  def foo() :foo; end
end

class C
  include M

  undef_method :foo
end

C.any_instance.stubs(:foo).returns(:mocha)

C.any_instance.unstub(:foo)
Fix order dependent tests

Reset ActionView::Base.logger after tests
Reset ActionView::Base.logger instead of AC::Base.logger

see: 9b0ac0bc74569db460f87ea6888b3847be0ff5be
Don't mutate the Base settings by merge!ing the given value
Fix order dependent tests

Restore default ActiveSupport::XmlMini.backend after tests
Be sure to restore the default I18n.locale after changed its value in a test
Refactor handling of action normalization

Reference:
Bloody mess internals
http://gusiev.com/slides/rails_contribution/static/#40
grab executable from rubygems

As done here d7fc97d3f90c0e30865d32ce202658f03248cacc
Excluding action_view/vendor in API [ci skip]
Revert "Fix the SQLite gem name"

This reverts commit 700c6c65bcce17d4c61423ceaef031bcbe203337.

Bot the `sqlite3` and `sqlite3-ruby` gems exist.
https://rubygems.org/gems/sqlite3
https://rubygems.org/gems/sqlite3-ruby

In fact, they both point to the same github repository.
https://github.com/luislavena/sqlite3-ruby

However, the last one hasn't been released since 2011, while the first
one keeps getting regular releases.
Removed excluding vendor from API doc [ci skip]

These folder not exists in system
Refix my misreading of the diff

sorry @robin850.
Thanks @fxn
Merge pull request #11611 from arunagw/api-generation-av

Excluding action_view/vendor in API[ci skip]