avoid name clash with phpcr-utils in composer
Merge pull request #223 from doctrine/rename-bin

avoid name clash with phpcr-utils in composer
add the rename to the bin section of composer.json as well
Allow selection of extending documents

- Adds new multivalue node type property phpcr:classparents
- Popualtes this with the class names of ALL extending classes on
  persist
- QueryBuilder selects on phpcr:class OR phpcr:classparents
Refactored a little and added test.
Fixes some text