[POC] [PCM] Allow automatic of node types loading from bundles

This PR adds support for automatically loading node type definitions from bundles, just like doctrine schemas.

- The node type files must be located in `Resources/config/phpcr-node-types`
- There is no bundle white / black list, if the folder exists and it contains node types, then they are loaded for *all* registered bundles

I don't *think* its a problem if we always load all node types from all registered bundles, after all, each node type file should be using its own namespace.

This PR builds uses https://github.com/phpcr/phpcr-utils/pull/108

Usage:

Load all node types from all bundles: (this PR)

````bash
$ php app/console doctrine:phpcr:node-type:register --allow-update
````

Load from individual folders or files: (phpcr-utils PR)

````bash
$ php app/console doctrine:phpcr:node-type:register --target=foobar/barfoo.cnd --target=src/MyBundle/mynodetypefolder
````