Move config.autoflush_log to correct template

This accidentally ended up in the development template
instead of the production template, where it makes
most sense.

Remove unused global variable in controller filters test

Remove skip_filter block param

Remove reference to rails_legacy_mapper, which isn't compatible with 3.2...

Make automatic log flushing configurable

Only set ActionView configuration inside the on_load block

Fix routes inspection order

Testcase for GH #5114.

Add config.default_method_for_update to support PATCH

PATCH is the correct HTML verb to map to the #update action. The
semantics for PATCH allows for partial updates, whereas PUT requires a
complete replacement.

Changes:
* adds config.default_method_for_update you can set to :patch
* optionally use PATCH instead of PUT in resource routes and forms
* adds the #patch verb to routes to detect PATCH requests
* adds #patch? to Request
* changes documentation and comments to indicate support for PATCH

This change maintains complete backwards compatibility by keeping :put
as the default for config.default_method_for_update.

AS::Callbacks: deprecate rescuable option

Closes #5025 part 2

Prefer || over 'or' for boolean operations

ordered_options will work if inherited from Hash, remove OrderedHash usage

Bug: cache_key.size doesn't return length of filename but size of file