Uui driver fix

So even if i gonna be beheaded, i do this PR in a blind way. Cause i can't test it - i got nothing installed caused by several dependency issues on `composer update`. 

What did i changed?
For xml/yml driver didn't exist a mapping for the uuid. Just for the annotation driver. So i created both. I added the condition for both drivers with creating the mapping the `ClassMetadata` needs. 
Created a new test with a fixtures too.

I will try to get the tests run at work tomorrow. As described in the mailing list, this PR would be a feature i would use like have had on Monday :-)