Update changelogs with version/release dates [ci skip]

Also add note about attr_protected change.
Fix changelog typos [ci skip]

Thanks to @jmccartie.
Update activemodel/CHANGELOG.md

Fixed a typo ;)
Merge pull request #9309 from joernchen/patch-2

Update activemodel/CHANGELOG.md
Revert "Merge pull request #9208 from dylanahsmith/3-2-mysql-quote-numeric"

This reverts commit 921a296a3390192a71abeec6d9a035cc6d1865c8.
Update gemspec to get mail 2.4 as the main version, 2.3.3 has security issues.
Merge pull request #9475 from queso/update-mail

Update gemspec to get mail 2.4 as the main version, 2.3.3 has security i...
stop calling to_sym when building arel nodes [CVE-2013-1854]
fix incorrect ^$ usage leading to XSS in sanitize_css [CVE-2013-1855]
JDOM XXE Protection [CVE-2013-1856]

Conflicts:
	activesupport/test/xml_mini/jdom_engine_test.rb
fix protocol checking in sanitization [CVE-2013-1857]

Conflicts:
	actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
bumping to 3.1.12
Merge branch '3-1-stable' into impulsesave-3-1-stable