build status added to README.md

README.md

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 SonataAdminBundle - The missing Symfony2 Admin Generator
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+[![Build Status](https://secure.travis-ci.org/sonata-project/SonataAdminBundle.png?branch=master)](http://travis-ci.org/sonata-project/SonataAdminBundle)
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 The online documentation of the bundle is in http://sonata-project.org/bundles/admin
 
 For contribution to the documentation you can find it on [Resources/doc](https://github.com/sonata-project/SonataAdminBundle/tree/master/Resources/doc).