New default: the template digest is automatically included in your ETags.
When you call `fresh_when @post`, the digest for `posts/show.html.erb`
is mixed in so future changes to the HTML will blow HTTP caches for you.
This makes it easy to HTTP-cache many more of your actions.

If you render a different template, you can now pass the `:template`
option to include its digest instead:

  fresh_when @post, template: 'widgets/show'

Pass `template: false` to skip the lookup. To turn this off entirely, set:

  config.action_controller.etag_with_template_digest = false

The error was moved outside of the `ClassMethods` module.

this will help us to encapsulate magical symbols so hopefully we can
eliminate hardcoded magic symbols

now we don't have to have a hard coded key

avoid hash lookups and remove depency on the instance

we don't need to repeat if statements

now we only have to look up @scope[:scope_level] once per call to
canonical_action? and we don't have a variable named "flag"

since we pass `as` down, then we won't have to do an insert / delete
dance with the options hash

The test was not failing for `assert_template file: nil` when a file
has been rendered.

This follows the good practice listed on http://guides.rubyonrails.org/debugging_rails_applications.html#impact-of-logs-on-performance.

This reverts commit 70597762, reversing
changes made to dde91e9b.

IT BROKE THE BUILD!!!

You can now configure custom digest for cookies in the same way as `serializer`:

config.action_dispatch.cookies_digest = \SHA256'

Provide the ability to extract the source code of the entire exception stack
trace, not just the frame raising the error. This improves debugging
capability of the error page, especially for framework-related errors.

The latest modification to the code was done in https://github.com/rails/rails/commit/5e3517ea. In Rails 3.2,
`ActionController#rescue_action` was deprecated and `rescue_action_without_handler` is no longer being used.

we know that this call only wants the path returned, so lets call a
method that returns the path.

Fixed broken test.

Thanks Stephen Richards for reporting.

Previously the generated parser had an intermediate local variable
`result` that really useful if you're building up a stateful object but
Journey always discards the result argument to the reduce functions.

This produces a simpler parser for anybody who actually wants to read
the thing.

Sadly, there's no real performance speedup with this change.

this allows us to avoid nil checks on the return value

there's no reason to to_sym the string if it doesn't match the regexp
anyway

hash lookup should be faster than searching an array.

These methods mutate the path variable/argument so there is no need
to reassign it every time.