[WIP] Query Builder V2 Reference

This is a GENERATED reference document. It is generated by the odm:

````
$ ./bin/phpcrodm doctrine:qb:dump-reference
````

This method has its good points and bad, PHPDocumentor is not really an option at the moment as I choose not to use Interface's to define types, and in anycase I think it is better to have this in RST.