Finalize swagger API documentation

[warlock39]

In the process of migrating from Silex to Symfony, it has been added swagger php annotations. But final swagger.json file was not generated as not important stage. Within this issue next items should be fixed:

• describe root swagger schema object
• add annotations for accessToken query param where it needed
• fix swagger annotations for referenced objects wich represents collection reference
• do not enumerate parameter types and format for in="body" params, it should greatly decrease annotation size
• it is required to have description field for param when it is in="body"?
• add description for each property of each entity
• generate valid swagger.json

[warlock39]

Documentation available at: http://api.qa.lunches.com.ua/docs.html