Revert "Added ActiveRecord::Base#last_modified to work with the new fresh_when/stale? conditional get methods from Action Pack"

Needless indirection with no added value.

This reverts commit 535853e8.

Added ActiveRecord::Base#last_modified to work with the new fresh_when/stale? conditional get methods from Action Pack

When default_asset_host_protocol is left as nil, it will use absolute protocols when a request is present, and relative protocols otherwise (eg in asset generation)

Log 'Filter chain halted as CALLBACKNAME rendered or redirected' every time a before callback halts.

`path_names` can only be used for affecting `new` and `edit`

The methods, "post?", "put?", "head?", etc. contain an incorrect
explanation. They state that they are equivalent to request_method ==
:type, but this is not accurate because the methods convert the string
to a symbol. They are actually equivalent to:
  request_method_symbol == :type

This reverts commit c4af5f00.

You can provide a namespace for your form to ensure uniqueness of id attributes on form elements.
The namespace attribute will be prefixed with underscore on the generate HTML id

- Handle scenario where @posts is empty.