removes item in the Active Record CHANGELOG

That change to update_attribute was considered
to be too subtle and was reverted in 30ea923
just before Rails 3 shipped. Later we introduced
update_column (Rails 3.1).
adding a test for #6459
updating changelog
* Do not convert digest auth strings to symbols. CVE-2012-3424
updating changelog with CVE
updating rails release date
bumping to 3.1.7
html_escape should escape single quotes

https://www.owasp.org/index.php/XSS_%28Cross_Site_Scripting%29_Prevention_Cheat_Sheet#RULE_.231_-_HTML_Escape_Before_Inserting_Untrusted_Data_into_HTML_Element_Content
Closes #7215
escape select_tag :prompt values

CVE-2012-3463
Do not mark strip_tags result as html_safe

Thanks to Marek Labos & Nethemba

CVE-2012-3465
Add CHANGELOG entries
Bump to 3.1.8
Add html_escape note to CHANGELOG

This was added to all other branches, but 3-1 missed the entry.

3-0-stable: 954e26263681896312b9133e07db3123e8b13c03
3-2-stable: ae2383d90a9646e36c8b5d92801fba284ea62ec0
master: 5c07be5f7fb7e6417c09751c7fb9bb98a63d9917
Remove warning when using html_escape with Ruby 1.9.

Closes #7323
Use benchmark/ips to measure AR performance

This means we can more easily compare numbers, and we don't have to
specify a single N for all reports, which previously meant that some
tests were running many more/fewer iterations than necessary.

Conflicts:
	Gemfile
	activerecord/examples/performance.rb
Increase benchmark time to 20 seconds.

I think that 5 seconds was a bit low for our purposes.

Also enable it to be configured via env vars.

We also need to scale the number of records up/down depending on how
long we're running the benchmark for.

Conflicts:
	activerecord/examples/performance.rb
CHANGELOGs are now per branch

Check 810a50d for the rationale.
Ensure association preloading properly merges default scope and association conditions
Require ActionController::Railtie in the default middleware stack.

This will make possible to do a frameworkless initialization since the
the default middleware stack is self contained.
test for 8018