Update composer.json

new version fix some issues ( _count with query filtered )
Fixing identifier field not being set in TransformerCollection
Added configuration mapping for properties key, allows configuing mapping for objects/nested documents
Updated the DoctrineMongoDB event subscriber tag
Allow providing a URL or host and port for client configurations
Merge branch '2.0'
adds to the config the index parameter, needed for disabling the analyzer or the indexing
Merge pull request #176 from Fran6co/fix-index-property

adds to the config the index parameter
Allow multiple servers in configuration
Added support for Symfony 2.2 to composer.json
Fix register custom finder for entity
add ability to configure nested mapping

``` yaml
foq_elastica:
    clients:
        default: { host: localhost, port: 9200 }
    indexes:
        website:
            client: default
            types:
                product:
                    mappings:
                        name: { type: string }
                        price: { type: float}
                        specifications:
                            type: object
                            properties:
                                name: {type: string}
                                value: {type: string, analyzer: keyword}
```
Transformer transforms nested documents
remove trailing whitespace
allow _parent mapping
add documentation for nested, object and _parent
Add tests for `_parent`, `nested` and `object` types
fixes php5.3 defines `~` for default empty `_parent` property
add `_parent` in mapping during index reset
Merge pull request #167 from Exercise/fixing_collection_identifier

Fixing identifier field not being set in TransformerCollection