API Change: Name is now either player_name or lobby_name
API Change: Return value of /list_lobbies
API Change: `update` instead of `update_position`

This requires an update function for vertices
Handler: Adjusting to the Ohm syntax
Tiny enhancements of the extracted player and lobby
Implemented Handler#update_vertex
Extracted the interface of the Vertex class
Setting up Player as an Ohm::Model
Player#update_statistics and Player#statistics
`set_statistics` is now `update_statistics`
Player require Ohm, not the spec
Implemented: Vertex Class
Leveraging Ohm's Conversions

Even simpler with ohm-contribute's DataTypes
Streamlining Player and Vertex Spec
Lobby: Implemented Basics / Ohm Integration
Lobby#start_game, Lobby#started?, Lobby#finish_game
Implemented correct edges behaviour for Lobby
Basics of handling vertices in the Lobby
Oups
Implemented: Lobby#update_vertex