Signed-off-by: NJosé Valim <jose.valim@gmail.com>

American English(according to Weber)

Needed to move AC::Metal::Instrumentation before AM::Metal::Rescue
so that status codes rendered from rescue_from blocks are logged
properly.

This is because only template rendering works with streaming.
Setting it at the class level was also changing the behavior
of JSON and XML responses, closes #1337.

This makes "sprockets/railtie" explicit. This means that sprockets will
be loaded when you require "rails/all". If you are not using requiring
"rails/all", you need to manually load it with all other framework
railties.

In order to be complete, this commit also adds --skip-sprockets to
the rails generator.

Make send_file guess content-type from file extension, if type wasn't supplied (Issue #1847). Update tests & documentation.

clarify which url would be used to cache a page when options are not provided to #cache_page to determine that url

elaborate on how web server configuration to check for static files on disk enables page caching to work without hitting the app server stack

make the logs a little simpler to view, put the render message inline with other events, pull processing to char[0] and add a new line to the completed. looks more like a block now, which is useful for serial actions like test/dev

It would raise undefined method controller_name for nil

Added missing assert to test checking form with namespaced isolated model and fixed helpers to work correctly in such case

This commit restores the ability to assign cookies for testing via
@request.env['HTTP_COOKIE'] and @request.cookies, e.g:

    @request.env['HTTP_COOKIE'] = 'user_name=david'
    get :index
    assert_equal 'david', cookies[:user_name]

and

    @request.cookies[:user_name] = 'david'
    get :index
    assert_equal 'david', cookies[:user_name]

Assigning via cookies[] is the preferred method and will take precedence
over the other two methods. This is so that cookies set in controller
actions have precedence and are carried over between calls to get, post, etc.

Assigning cookies for test cases should now use cookies[], e.g:

  cookies[:email] = 'user@example.com'
  get :index
  assert_equal 'user@example.com', cookies[:email]

To clear the cookies, use clear, e.g:

  cookies.clear
  get :index
  assert_nil cookies[:email]

We now no longer write out HTTP_COOKIE and the cookie jar is
persistent between requests so if you need to manipulate the environment
for your test you need to do it before the cookie jar is created.

Fixed while traveling to heuruko

Replace references to ActiveSupport::SecureRandom with just SecureRandom, and require 'securerandom' from the stdlib when active support is required.

- exclude Rack::Test::UploadedFile to pass existing tests. Are there any
  other types we're missing?

This reduces false positives that come from using ints in params in
tests, which do not get converted to strings in the tests. In
implementations going through rack, they do get converted to strings.

- David Chelimsky and Sam Umbach

renamed the wrap_parameters :only and :except options to :include and :exclude to make it consistent with controller filters

Normally the table for abstract class won't be existed, so we should not trying to call `#column_names` on it.