Add a kernelReset attribute to controle kernel reseting on client
creation.
Add: annotation to disable kernel reset
add maximum number of sub-processus which will be run simultaneously option
Fix DOMNode with symfony/dom-crawler v2.4.*

Since https://github.com/symfony/DomCrawler/commit/4f18ccf4b66c9c1af365756f3678d3c394d4a542, symfony/dom-crawler has changed a bit :
the \Symfony\Component\DomCrawler\Crawler::attr($attribute) has changed a bit. When asked for an attribute it now checks if the node has
the attribute and then return its value or null. So when trying to get an unknown attribute, we know get a null value instead of an
mepty string.

This commit backports part of the symfony/dom-crawler:v2.4.* logic to get the same behavior with 2.3.* so that we support both versions
of dom-crawler and have the same behavior.
Update readme
Add a branch alias to composer.json
CS Fix & PHPDoc
add maximum number of sub-processus which will be run simultaneously option
Merge branch 'add-max-children-number-option' of github.com:flavien-effinet/AtoumBundle into add-max-children-number-option
Merge pull request #57 from flavien-effinet/add-max-children-number-option

add maximum number of sub-processus which will be run simultaneously option
Merge pull request #58 from atoum/cleaning-cs-phpdoc

Cleaning CS & PHPDoc
fix grammar mistake
Merge pull request #61 from mathias-strasser/patch-2

fix grammar mistake