Upgraded to PhpcrBundle 1.2 and added phpcr-shell to dev

Upgraded to doctrine phpcrbundle 1.2 and added phpcr-shell as a dev dependency:

`````
$ php app/console doctrine:phpcr:shell

Welcome to the PHPCRSH shell (1.0.0-alpha6).

At the prompt, type help for some help.

- To list all of the commands type list.
- To list all of the registered command aliases, type aliases.

To exit the shell, type exit.

PHPCRSH >
`````