Added config to force Symfony to use native session handler by default

Added comment for handler_id
backported #585
feature #606 Added config to force Symfony use native session handler by default (pulzarraider)

This PR was submitted for the master branch but it was merged into the 2.4 branch instead (closes #606).

Discussion
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Added config to force Symfony use native session handler by default

As far as I know Symfony is using NativeFileSessionHandler to save session data to file. This breaks server configuration, because if php is configured to use Memcache or Redis session handler, symfony stores session data to file in app/cache directory and ignores default php session settings.

Correct me if I am wrong, but Symfony should use native session handler that is configured in php ini settings by default (to create less WTFs).

Commits
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89f82c8 Added config to force Symfony to use native session handler by default
updated to FrameworkExtraBundle 3.0 (examples updated as well)
updated VENDORS for 2.4.0-RC1
Allow Doctrine 2.4 to be installed
bumped 2.4 to stable
make htaccess deny in src and app work with apache 2.4
bug #621 make htaccess deny in src and app work with apache 2.4 (Tobion)

This PR was merged into the 2.3 branch.

Discussion
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make htaccess deny in src and app work with apache 2.4

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | |no
| Tests pass?   | yes
| Fixed tickets | #602
| License       | MIT

Based on findings in https://drupal.org/node/1599774
Made it work under both apache 2.2 and 2.4.

Commits
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38c2a50 make htaccess deny in src and app work with apache 2.4
Fixed PHPUnit doc URL

Any links to `www.phpunit.de` now redirects to the front page. Stripping `www.` off fixes the issue.
minor #623 Fixed PHPUnit doc URL (gnugat)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #623).

Discussion
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Fixed PHPUnit doc URL

Any links to `www.phpunit.de` now redirects to the front page. Stripping `www.` off fixes the issue.

Commits
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e958959 Fixed PHPUnit doc URL
Merge branch '2.4'

* 2.4:
  bumped 2.4 to stable
  updated VENDORS for 2.4.0-RC1
  updated to FrameworkExtraBundle 3.0 (examples updated as well)
  backported #585
  Added config to force Symfony to use native session handler by default
bumped Symfony version to 2.5@dev
moved generator bundle from require to require-dev in composer deps
Merge branch '2.3' into 2.4

* 2.3:
  Fixed PHPUnit doc URL
  make htaccess deny in src and app work with apache 2.4
Merge branch '2.4'

* 2.4:
  Fixed PHPUnit doc URL
  make htaccess deny in src and app work with apache 2.4
minor #612 Allow Doctrine 2.4 to be installed (jdespatis)

This PR was merged into the 2.3 branch.

Discussion
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Allow Doctrine 2.4 to be installed

The commit https://github.com/symfony/symfony-standard/commit/0cafa504b6d1235c901d127da01c996219341e6c#diff-b5d0ee8c97c7abd7e3fa29b9a27d1780, lets Doctrine 2.4 installable

But it has been performed only on `master`, `2.4`

Any reason why it shouldn't also be backported to last stable version of `symfony-standard` (`2.3`) ?

Commits
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42937c1 Allow Doctrine 2.4 to be installed
tweaked README
moved some dev settings to parameters.yml
feature #603 moved some dev settings to parameters.yml (kriswallsmith)

This PR was squashed before being merged into the 2.4-dev branch (closes #603).

Discussion
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moved some dev settings to parameters.yml

So developers can enable or disable this stuff.

Commits
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f40a391 moved some dev settings to parameters.yml