Comment Api

[dennib]

Should we merge at this point? Left some thoughts in last commit page about async call response handling

• Route behavior to render comments or return them as JSON data
• What data is better to return as JSON for API use

Also, one last thing: do we still need the part of the route /game/:gameID for retrieving comment (sync mode) or we can just delete it?

[avivace]

See #10