Add CHANGELOG section for unreleased Rails 3.2.4; document addition of #beginning_of_hour and #end_of_hour to Time and DateTime core extensions.

Also add missing entries and use the formating convention

Set "March 1, 2012" as the release date for 3.2.2, 3.1.4, 3.0.12

Also remove an unasserted line in the tests.

All the logic is based on the HTML_ESCAPE constant available in
ERB::Util, so it seems more logic to have the entire method there and
just delegate the helper to use it.

This reverts commit 4d20de8a.

Conflicts:

	activesupport/CHANGELOG.md
	activesupport/lib/active_support/core_ext/enumerable.rb
	activesupport/test/core_ext/enumerable_test.rb

  from Ruby stdlib.

This reverts commit 2bc8e571.

Reason: Changelogs are not meant to be changed in docrails.

    logs for a certain block, change the log level for that block.

*   ActiveSupport::BufferedLogger#open_log is deprecated.  This method should
    not have been public in the first place.

*   ActiveSupport::BufferedLogger's behavior of automatically creating the
    directory for your log file is deprecated.  Please make sure to create the
    directory for your log file before instantiating.

*   ActiveSupport::BufferedLogger#auto_flushing is deprecated.  Either set the
    sync level on the underlying file handle like this:

        f = File.open('foo.log', 'w')
        f.sync = true
        ActiveSupport::BufferedLogger.new f

    Or tune your filesystem.  The FS cache is now what controls flushing.

*   ActiveSupport::BufferedLogger#flush is deprecated.  Set sync on your
    filehandle, or tune your filesystem.

Module#synchronize is deprecated with no replacement.  Please use `monitor` from ruby's standard library.

Reasons:

 * Markdown reads well as plain text, but can also be formatted.
 * It will make it easier for people to read on the web as Github
   formats the Markdown nicely.
 * It will encourage a level of consistency when people are writing
   CHANGELOG entries.

The script used to perform the conversion is at
https://gist.github.com/1339263