Provide Entry point for batch attribute update

[offtherailz]

Add an entry point accessible only by ADMIN user that allows to :

• provide a XML filter to select some resources
• Update one attribute to all the resources

POST /misc/resources/attribute/

<Filter> ...</Filter> 
{ --> xml
	"restAttribute": {
		"name": "test",
		"value": "MyTest1"
	}
}

This should allow also to remove the attribute at all setting giving "value": null or "value": undefined

An entry point for get or delete in batch all resources that match the filter is a plus.

DELETE /misc/resources/

[tdipisa]

We should consider to have a bach update for resource permissions too.