Big API refactoring. This is already the v2.
Api v3 :
- adding a player to a game return a player resource
- adding a move to a game return a move
- getting a player or a move return an exception
Oops I did it once again : create a player return a player resource, not
a move
convert exception to HTTP errors
add SSE
Merge pull request #2 from NicolasGeraud/master

v2 of the API