fix Helpers::DateHelper with :use_hidden - hide separators

Incorporating Pacific Island zone changes circa Dec 31 2011

Improve changelog of new :silence deprecation behavior

build fix for observing_test.rb

introduced here 17c990b1

Replace boolean argument with an options hash.

Added a generator option to skip the public/index.html file

This replaces `include_seconds` argument with an option key
`include_seconds => true` in options hash.

Also `time_ago_in_words` now passes options hash, including a `locale`
key, which makes in compatible with `distance_of_time_in_words`.

allow send_file/send_data to skip disposition header, closes #2973

Fix the Flash middleware loading the session on every request 

Observer: simplify tests

options aren't modified inside send_file_headers!

fix inflector bug where -ice gets singularized into -ouse

Build fix for observed_classes

wrap translate defaults to use translate helper features

IE since version 6 and recently Chrome and Firefox have started following
302 redirects from XHR requests other than GET/POST using the original request
method. This can lead to DELETE requests being redirected amongst other things.

Although it doesn't directly affect the Rails framework since it doesn't return
a 302 redirect to any non-GET/POST request a note has been added to raise
awareness of the issue. Some references:

Original article from @technoweenie:
http://techno-weenie.net/2011/8/19/ie9-deletes-stuff/

Hacker News discussion of the article:
http://news.ycombinator.com/item?id=2903493

WebKit bug report:
https://bugs.webkit.org/show_bug.cgi?id=46183

Firefox bug report and changeset:
https://bugzilla.mozilla.org/show_bug.cgi?id=598304
https://hg.mozilla.org/mozilla-central/rev/9525d7e2d20d

Chrome bug report:
http://code.google.com/p/chromium/issues/detail?id=56373

HTTPbis bug report and changeset:
http://trac.tools.ietf.org/wg/httpbis/trac/ticket/160
http://trac.tools.ietf.org/wg/httpbis/trac/changeset/1428

Roy T. Fielding's history of the issue:
http://ftp.ics.uci.edu/pub/ietf/http/hypermail/1997q3/0611.html

Automated browser tests for the issue:
http://www.mnot.net/javascript/xmlhttprequest/

Fixes #4144

introduced here
bad44e4f

Remove button_to_function and link_to_function helpers

Remove some unused variable assignments

railties variable is not required here.

Fix Observer by acting on singleton class. Fixes #3505.

Also [issue #1034] [pull #6068]

confirmation validation error attribute

Fix typo

AS::Callbacks#run_callbacks optimized to reduce backtrace

Remove some warnings and minor refactor in RoutesReloader

Tweak observer

Remove repeated word