Prior to this patch the existing .force_ssl method handles both defining
the filter and handling the logic for performing the redirect.

With this patch the logic for redirecting to the HTTPS protocol is
separated from the filter logic that determines if a redirect should
occur.  By separating the two levels of behavior, an instance method
for ActionController (i.e. #force_ssl_redirect) is exposed and available
for more granular SSL enforcement.

Cleaned up indentation.

More info http://edgeguides.rubyonrails.org/api_app.html

[Carlos Antonio da Silva & Santiago Pastorino]

`ActionController.force_ssl` redirects http URLs to their https equivalent;
however, when a URL contains a query string, the resulting redirect lacked the
original query string.

Conflicts:

	actionpack/lib/action_controller/metal/force_ssl.rb

When force redirecting to SSL, make sure that the session is kept. As we're moving from a non-secure to secure environment, it's safe

This would become useful for site which sometime transferring sensitive information such as account information on particular controller or action.

This featured was requested by DHH.