updated version to 2.4
Merge branch '2.3'

* 2.3:
  updated versions in the README file
  Remove +x mode on file
  updated doc links
  Fix deprecated function bind
  fixed typo
  updated composer.json
  updated VENDORS for 2.1.10
updated versions in the README file
allow master branch to install 2.4-dev
added a hello world command in demo bundle
configure the log to console handler

we require ~2.4 now as we use a new feature that was introduced in 2.4
also allow doctrine 2.4 to be installed
merged branch Tobion/allow-dev-2.4 (PR #557)

This PR was merged into the master branch.

Discussion
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Add hello world command to demo bundle and configure new log to console handler

First commit: allows the master branch to install 2.4-dev.
Second commit: added a hello world command in demo bundle
Third commit: configure the log to console handler that is possible since symfony/MonologBundle#42

Commits
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0cafa50 also allow doctrine 2.4 to be installed
b47328a configure the log to console handler
7baa790 added a hello world command in demo bundle
8a246dc allow master branch to install 2.4-dev
Merge branch '2.3'

* 2.3:
  Use kernel.http_method_override parameter
  udpated the CHANGELOG for 2.3
  Added 2.3 upgrade notes containing app_dev.php changes regarding debug component.
  updated VENDORS for 2.3.0
  Fixed accidentally removed status code in app/check.php

Conflicts:
	composer.json
made browser logs commented by defaults (refs #8413)
merged branch symfony/monolog-tweaks (PR #569)

This PR was merged into the master branch.

Discussion
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made browser logs commented by defaults (refs symfony/symfony#8413)

FirePHP and ChromePHP are now disabled by default as they can make the application broke if the web server is not configured with large header sizes.

see symfony/symfony#8413

Commits
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262af2d made browser logs commented by defaults (refs #8413)
added an UPGRADE file for 2.4
Unregister initial loader when using ApcClassLoader
merged branch Seldaek/patch-3 (PR #570)

This PR was merged into the master branch.

Discussion
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Unregister initial loader when using ApcClassLoader

I think it's quite bad to have twice the same loader registered because for autoloading classes (or class_exists calls) not handled by the main symfony/composer loader, it'll be called twice.

Commits
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43b3c14 Unregister initial loader when using ApcClassLoader
added some functional tests for the secure section of the demo bundle
merged branch fabpot/more-tests (PR #590)

This PR was merged into the master branch.

Discussion
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added some functional tests for the secure section of the demo bundle

Commits
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8a5dd7f added some functional tests for the secure section of the demo bundle
Added comment about http_method_override and HttpCache
Merge branch '2.3'

* 2.3:
  Revert "merged branch eventhorizonpl/fix_doctrine_common_dependency (PR #591)"
  fix doctrine-common dependency for 2.3 version
  updated VENDORS for 2.3.4
  updated VENDORS for 2.3.3
  Update phpDoc to make it standard compliant
  Updated the profiler configuration for the 2.3 changes
  updated VENDORS for 2.3.2
  Small typo/grammar fix.
  remove app cache, logs .gitkeep to ignore file
feature#592 Added comment about http_method_override and HttpCache (kbond)

This PR was merged into the master branch.

Discussion
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Added comment about http_method_override and HttpCache

related: symfony/symfony#8481

Commits
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b6ee002 Added comment about http_method_override and HttpCache
Refactored contact action to use new form methods in 2.3