Add mongodb session storage

Some changes based on @stof and @stloyd suggestions

Some changes based on @vicb suggestions

Some changes based on @vicb suggestions

Add changes
fix hanging of unit tests on Windows
fix php5.4 problem
[2.1][CHANGELOG]: Finder, Comparator new features
[2.1][Component][ClassLoader] cs
merged branch gajdaw/2_1_changelog (PR #4074)

Commits
-------

86cf3fd [2.1][CHANGELOG]: Finder, Comparator new features

Discussion
----------

[2.1][CHANGELOG]: Finder, Comparator new features

Bug fix: no
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -
merged branch gajdaw/2_1_component_classloader_cs (PR #4073)

Commits
-------

bc8855e [2.1][Component][ClassLoader] cs

Discussion
----------

[2.1][Component][ClassLoader] cs

Bug fix: no
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -

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by fabpot at 2012-04-23T06:18:26Z

Can you please remove the changes you have already made in the other PR as I merge 2.0 into master regularly. Then, you will need to squash you commits to avoid any conflict when merging will occur. Thanks.

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by gajdaw at 2012-04-23T06:50:58Z

I hope that's it.
merged branch pulzarraider/windows_proces_hang_fix (PR #4069)

Commits
-------

e3296cb fix php5.4 problem
c2405c0 fix hanging of unit tests on Windows

Discussion
----------

[WIP] [Process] Fix hanging of unit tests on Windows

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: #3798
Todo: -

This PR tries to fix hanging unit tests on Windows platform. The problem is caused by known [PHP bug](https://bugs.php.net/bug.php?id=51800). PHP hangs forever while reading from STDOUT pipe if the output is too big.

I tried different combinatios and this is not ideal, but a working patch - STDOUT is sending to a file.

@Tobion, @drak and other developers working on Windows - can you please confirm, if this solution works for you, too?

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by Seldaek at 2012-04-22T20:56:20Z

Tried it on 5.4.0 - I get the following when I checkout your branch:

```
SS..........ESSSSSSSSSS...E.S

Time: 0 seconds, Memory: 19.75Mb

There were 2 errors:

1) Symfony\Component\Process\Tests\ProcessTest::testProcessResponses with data set #0 ('output', 'getOutput', 'echo \'output\';')
Undefined offset: 1

C:\Users\seld\Web\symfony\framework\src\Symfony\Component\Process\Process.php:342
C:\Users\seld\Web\symfony\framework\src\Symfony\Component\Process\Process.php:168
C:\Users\seld\Web\symfony\framework\src\Symfony\Component\Process\Tests\ProcessTest.php:46

2) Symfony\Component\Process\Tests\ProcessTest::testIsRunning
Undefined offset: 1

C:\Users\seld\Web\symfony\framework\src\Symfony\Component\Process\Process.php:342
C:\Users\seld\Web\symfony\framework\src\Symfony\Component\Process\Tests\ProcessTest.php:106
```

When I remove the skipping of `ProcessTest::testProcessPipes` - it still hangs so it looks like your fix is not working.

Just for reference, with latest master checkout I get this:

```
SS...........SSSSSSSSSS.....S

Time: 2 seconds, Memory: 19.75Mb

OK, but incomplete or skipped tests!
```

Don't have time right now, but if I find time to look at your diff in more details I will, maybe it's possible to fix it.

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by pulzarraider at 2012-04-22T22:23:05Z

@Seldaek Thanks, fixed php5.4 problem, my php5.3.8 passed every Process tests.

This patch isn't fixing problem with pipes in general. I don't think it's even possible from PHP code. We have to wait for PHP core developers to fix this problem. This patch only fix issue with hanging unit tests (not the one with pipes you mentioned). In my environment, symfony unit tests never finished and hangs on SwitchUserTest from SecurityBundle on 98%. Now with this patch, I can see final informations about all tests and their errors.

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by Seldaek at 2012-04-23T07:44:16Z

Ok, it passes again on 5.4.
merged branch Baachi/mongo-session-storage (PR #4013)

Commits
-------

40df3bf Add mongodb session storage

Discussion
----------

[HttpFoundation][Session] Add mongodb session storage

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -

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by Baachi at 2012-04-19T19:05:19Z

Review please :)

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by Baachi at 2012-04-19T19:49:42Z

@stof Can be merged?

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by stof at 2012-04-19T19:51:28Z

I'm not a Mongo expert but it seems fine. You simply need to wait @fabpot's final review now

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by Baachi at 2012-04-19T19:52:53Z

Okay, thanks :)

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by Baachi at 2012-04-20T06:21:52Z

@vicb Sorry, for the email flood :)

I implemented all your suggestions.

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by fabpot at 2012-04-22T08:27:19Z

@drak, @vicb: Is it ok now?

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by vicb at 2012-04-22T08:33:31Z

I am ok with this PR
update CHANGELOG for 2.1
[Form] added method `guessPattern` to FormTypeGuesserInterface

rephrase changelog
merged branch ruian/guess_pattern (PR #4077)

Commits
-------

f7200e4 [Form] added method `guessPattern` to FormTypeGuesserInterface

Discussion
----------

[Form] add guess pattern

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: https://github.com/symfony/symfony/issues/3766
Todo: -

Due to some trouble when rebase my previous PR i open a new one with Master merged
Refs PR: https://github.com/symfony/symfony/pull/3927

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by fabpot at 2012-04-23T10:25:57Z

@vicb @bschussek ok for you?

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by bschussek at 2012-04-23T10:26:51Z

please do also rephrase the commit message to something clearer, like

    [Form] added method `guessPattern` to FormTypeGuesserInterface

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by bschussek at 2012-04-23T10:27:35Z

Otherwise this looks good :)

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by ruian at 2012-04-23T10:29:18Z

every changes done