Add ezpublish-kernel to frameworks.yaml

This is related to effort in https://github.com/ezsystems/ezpublish-kernel/pull/735 to add HHVM support in eZ Publish, one of the most advanced CMS systems in PHP.

Currently exposes several possible issues in HHVM in handling of DateTime, ArrayObject, XML namespace and others which has not been identified yet.


# Current status 

## php on host (OS X):

$ php -v
> PHP 5.4.24 (cli) (built: Jan 19 2014 21:32:15) 
> Copyright (c) 1997-2013 The PHP Group
> Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
>    with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans

> Time: 3.71 minutes, Memory: 252.75Mb
> 
> OK, but incomplete or skipped tests!
> Tests: 7197, Assertions: 16885, Incomplete: 3, Skipped: 197.

(yes our code also passes on [PHP 5.5 on travis](https://travis-ci.org/ezsystems/ezpublish-kernel/builds/20518270))

## hhvm on guest vm (Ubuntu 13.10 x64):

> vagrant@vagrant-ubuntu-saucy-64:~/ezpublish-kernel$ hhvm --version
> HipHop VM 2.5.0-dev+2014.03.11 (rel)
> Compiler: heads/master-0-g4165c07c5959ee2b92852b9868b4dd57872b6dde
> Repo schema: 6c75fcca79c02c97a757322bdd870b8a437bae7f

> Time: 1.69 minutes, Memory: 859.22Mb
> 
> FAILURES!
> Tests: 7161, Assertions: 16747, Failures: 137, Errors: 6, Incomplete: 3, Skipped: 233.

# Failures & errors

Failures most likely caused by HHVM behaving differently then Zend engine, links to code provided.

## Datetime

```
4) eZ\Publish\Core\FieldType\Tests\PageTest::testToHash with data set #1 (, array('2ZonesLayout1', array(array('6c7f907b831a819ed8562e3ddce5b264', 'left', array(array('1e1e355c8da3c92e80354f243c6dd37b', 'Campaign', 'Campaign', 'default', '', '6c7f907b831a819ed8562e3ddce5b264', array(array(10, 20, 30, 'Thursday, 01-Jan-70 00:00:01 GMT+0000', 'Thursday, 01-Jan-70 00:00:02 GMT+0000', 'Thursday, 01-Jan-70 00:00:03 GMT+0000', 'Thursday, 01-Jan-70 00:00:04 GMT+0000', '67dd4d9b898d89733e776c714039ae33', 'modify', '594491ab539125dc271807a83724e608', array('value'))), array('value2'))), array('value3'))), array('value4')))
toHash() method did not create expected result.
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
                             'priority' => 30
-                            'publicationDate' => 'Thursday, 01-Jan-70 00:00:01 GMT+0000'
-                            'visibilityDate' => 'Thursday, 01-Jan-70 00:00:02 GMT+0000'
-                            'hiddenDate' => 'Thursday, 01-Jan-70 00:00:03 GMT+0000'
-                            'rotationUntilDate' => 'Thursday, 01-Jan-70 00:00:04 GMT+0000'
+                            'publicationDate' => 'Thursday, 01-Jan-70 00:00:01 CET'
+                            'visibilityDate' => 'Thursday, 01-Jan-70 00:00:02 CET'
+                            'hiddenDate' => 'Thursday, 01-Jan-70 00:00:03 CET'
+                            'rotationUntilDate' => 'Thursday, 01-Jan-70 00:00:04 CET'
                             'movedTo' => '67dd4d9b898d89733e776c714039ae33'
                             'action' => 'modify'
                             'blockId' => '594491ab539125dc271807a83724e608'
                             'attributes' => Array (...)
                         )
                     )
                     'attributes' => Array (...)
                 )
             )
             'attributes' => Array (...)
         )
     )
     'attributes' => Array (...)
 )
```

[Link toHash()](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/Tests/FieldTypeTest.php#L528), [link to data provider](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/Tests/PageTest.php#L283)

and

```
10) eZ\Publish\Core\Persistence\Legacy\Tests\Content\Type\Gateway\DoctrineDatabaseTest::testLoadGroupData
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
     0 => Array (
-        'created' => '1031216941'
+        'created' => '1033922113'
         'creator_id' => '14'
         'id' => '2'
         'modified' => '1033922113'
         'modifier_id' => '14'
         'name' => 'Users'
     )
 )
```
[Link test](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/Persistence/Legacy/Tests/Content/Type/Gateway/DoctrineDatabaseTest.php#L292), [link fixture data](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/Persistence/Legacy/Tests/Content/Type/Gateway/_fixtures/existing_groups.php)

## ArrayObject

```
5) eZ\Publish\SPI\Tests\FieldType\DateIntegrationTest::testLoadContentTypeField
eZ\Publish\API\Repository\Exceptions\PropertyNotFoundException: Property 'defaultType' not found on class 'eZ\Publish\Core\FieldType\FieldSettings'

/home/vagrant/ezpublish-kernel/eZ/Publish/Core/FieldType/FieldSettings.php:54
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/FieldValue/Converter/Date.php:96
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/Mapper.php:362
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/Mapper.php:209
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/Mapper.php:120
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/Handler.php:251
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/Handler.php:196
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/Persistence/Legacy/Content/Type/MemoryCachingHandler.php:155
/home/vagrant/ezpublish-kernel/eZ/Publish/SPI/Tests/FieldType/BaseIntegrationTest.php:317
```
[Link to FieldSettings.php:54](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/FieldSettings.php#L21), [Link to Date.php:96](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/Persistence/Legacy/Content/FieldValue/Converter/Date.php#L81)

## XML namespace

```
2) eZ\Publish\Core\FieldType\Tests\RichTextTest::testToPersistenceValue
eZ\Publish\Core\Base\Exceptions\NotFoundException: Could not find 'Validator' with identifier ''

/home/vagrant/ezpublish-kernel/eZ/Publish/Core/FieldType/RichText/ValidatorDispatcher.php:79
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/FieldType/RichText/Type.php:168
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/FieldType/FieldType.php:391
/home/vagrant/ezpublish-kernel/eZ/Publish/Core/FieldType/Tests/RichTextTest.php:216
```
[Link to ValidatorDispatcher.php:79](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/RichText/ValidatorDispatcher.php#L50), [link to test](https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/Tests/RichTextTest.php#L203)