minor #603 generate annotations in yml format (dbu)

This PR was submitted for the master branch but it was merged into the 1.1 branch instead (closes #603).

Discussion
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generate annotations in yml format

replaces #568

i went with yml rather than annotations. what would annotations do, service definitions by annotations?

Commits
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9cf0231 generate annotations in yml format. fix #568

Author: wouterj

cookbook/creating_a_cms/getting-started.rst

@@ -83,7 +83,7 @@ Now you can generate the bundle in which you will write most of your code:
 
 .. code-block:: bash
 
-    $ php app/console generate:bundle --namespace=Acme/BasicCmsBundle --dir=src --no-interaction
+    $ php app/console generate:bundle --namespace=Acme/BasicCmsBundle --dir=src --format=yml --no-interaction
 
 The Documents
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