Add destroyed? to ActiveRecord, include tests for polymorphic urls for destroyed objects and refactor mime responds tests and documentation.

  * It is not possible to always pre-determine the layout before going to ActionView.
    This was *already* broken for render :partial => @object, :layout => true. This is
    now handled by overriding render_to_body in layouts.rb and manually injecting the
    partial's response. This needs to be done in ActionController since ActionController
    knows enough to get _layout_for_option. There is probably a better abstraction here.
  * As a result, all partial rendering can correctly restrict their layouts to the mime
    type of the rendered partial. This could have previously caused a bug in some edge cases.
  * If other layout-like options are added, they might need to add special code for the
    case of render :partial. We should try to think of an alternate solution, if possible,
    but this works for the cases we know of now.

  * TODO: Review ActionController calling render_template for certain partials.
    Might we be able to save logic by always delegating to AV's render_partial?

  * _render_single_template, which renders a template without layout
  * _render_partial_unknown_type, which renders a partial of unknown type
    (the entry method for most partial rendering; supports strings, objects, and collections)
  * _render_partial_object, which renders a partial for a single object.
  * extracted _render_partial_path so it can be used to render the spacer without going
    through the public render :partial

  * rename _render_partial to _render_partial_unknown_type to reflect that for this call, 
  	we don't know the type.
  * Merge _render_partial_with_block and _render_partial_with_layout to _render_partial
    * TODO: Check to see if any more logic can be shared
    * TODO: See about streamlining block path so we can get rid of @_proc_for_layout
  * Remove @exempt_from_layout as it is no longer needed

  * remove no longer used _array_like_objects
  * _render_content_with_layout renamed to _render_content since layout it optional
  * remove check for optional layout before _render_content

Replace _action_view with view_context to reflect that it is public and that it does not need to be an ActionView instance

[#2959 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Make sure javascript_include_tag/stylesheet_link_tag does not append ".js" or ".css" onto external urls [#1664 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Revert "fallback_string_to_date sets Date._parse comp arg to true, so that strings with two-digit years, e.g. '1/1/09', are interpreted as modern years" [#2019 state:wontfix]

This reverts commit 55d1d12c.

Added reset_attribute! method to ActiveRecord::AttributeMethods::Dirty which will reset an attribute to its original value should it have changed.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Modified ActiveRecord::AttributeMethods to allow classes to specify attribute method prefixes and/or suffixes. Previously only suffixes were allowed.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

fallback_string_to_date sets Date._parse comp arg to true, so that strings with two-digit years, e.g. '1/1/09', are interpreted as modern years [#2019 state:resolved]

quoted_date converts time-like objects to ActiveRecord::Base.default_timezone before serialization. This allows you to use Time.now in find conditions and have it correctly be serialized as the current time in UTC when default_timezone == :utc [#2946 state:resolved]