[WIP] Fix tests for 3-2-stable

- Set sudo: false in .travis.yml which uses latest travis engine and fixes some failing specs
- Use older version of gems in Gemfile if RUBY_VERSION < '1.9.3' (no change to .gemspec)
- Fix two cases of hash rockets in tests (required for Ruby 1.8.7)
- Skip failing test "test_ensure_that_migration_tasks_work_with_mountable_option" which breaks due to Bundler no longer accepting the default generated .gemspec format.
- Skip railties specs on Ruby 1.8.7 (mark as an allowed failure.)

Remove dead code and ensure values are strings before calling gsub

* 3-2-22-3:
  bumping version
  Include missing module in tag_helper

Since 68574151 we are using #safe_join to
join the content when an Array is given, so we must include the dependent
module here to make sure it's available when this module is used alone.

This was making Simple Form tests to fail with current master due to the
missing dependency.

* 3-2-22-3:
  bumping version
  ensure tag/content_tag escapes " in attribute vals

Many helpers mark content as HTML-safe without escaping double quotes -- including `sanitize`. Regardless of whether or not the attribute values are HTML-escaped, we want to be sure they don't include double quotes, as that can cause XSS issues. For example: `content_tag(:div, "foo", title: sanitize('" onmouseover="alert(1);//'))`

CVE-2016-6316

Associations do not call `.to_proc` on Hash

  Fixes #25010

[skip ci]

`render(params)` is dangerous and could be a vector for attackers.

Don't allow calls to render passing params on views or controllers.

On a controller or view, we should not allow something like `render
params[:id]` or `render params`.
That could be problematic, because an attacker could pass input that
could lead to a remote code execution attack.

This patch is also compatible when using strong parameters.

CVE-2016-2098

Render could leak access to external files before this patch.
A previous patch(CVE-2016-0752), attempted to fix this. However the tests
were miss-placed outside the TestCase subclass, so they were not running.

We should allow :file to be outside rails root, but anything else must
be inside the rails view directory.

The implementation has changed a bit though. Now the patch is more
similar with the 4.x series patches.
Now `render 'foo/bar'`, will add a special key in the options
hash, and not use the :file one, so when we look up that file, we
don't set the fallbacks, and only lookup a template, to constraint the
folders that can be accessed.

CVE-2016-2097

Generated engines should call `protect_from_forgery`.  If this method
isn't called, then the Engine could be susceptible to XSS attacks.
Thanks @tomekr for reporting this to us!

Conflicts:
	railties/lib/rails/generators/rails/plugin/templates/app/controllers/%namespaced_name%/application_controller.rb.tt
	railties/test/generators/plugin_generator_test.rb

This works on OSX but for some reason travis is throwing a
```
  1) Error:
ExpiresInRenderTest#test_dynamic_render_with_absolute_path:
NoMethodError: undefined method `unlink' for nil:NilClass
```
Looking at other tests in Railties the file has a name and we close
it before unlinking, so I'm going to try that.

Rails 3.2 supports 1.8.7 but 1.8.7 does not support the new hash syntax.

Test that we are not allowing you to grab a file with an absolute path
outside of your application directory. This is dangerous because it
could be used to retrieve files from the server like `/etc/passwd`.

Due to a change in test-unit 3.1.6 that supports yielding from setup to
run a test, lock 3-2-stable to 3.0.x releases of test-unit to fix the build.

Fix 3-2-stable 1.8 compatibility.

Use Ruby 1.8 compat syntax in test of security fix in activerecord/test/cases/nested_attributes_test.rb.

closes GH-23248

* 3-2-sec:
  bumping version
  allow :file to be outside rails root, but anything else must be inside the rails view directory
  Don't short-circuit reject_if proc
  stop caching mime types globally
  use secure string comparisons for basic auth username / password

Conflicts:
	actionpack/test/controller/render_test.rb
	actionview/lib/action_view/template/resolver.rb

CVE-2016-0752

When updating an associated record via nested attribute hashes the
reject_if proc could be bypassed if the _destroy flag was set in the
attribute hash and allow_destroy was set to false.

The fix is to only short-circuit if the _destroy flag is set and the
option allow_destroy is set to true. It also fixes an issue where
a new record wasn't created if _destroy was set and the option
allow_destroy was set to false.

CVE-2015-7577

Unknown mime types should not be cached globally.  This global cache
leads to a memory leak and a denial of service vulnerability.

CVE-2016-0751

this will avoid timing attacks against applications that use basic auth.

Conflicts:
	activesupport/lib/active_support/security_utils.rb

Conflicts:
	actionpack/lib/action_controller/metal/http_authentication.rb

CVE-2015-7576

mysql 0.3.x is forced here activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb