Server: implement Teams RESTful API

[sergeyt]

It should be done after doc is ready (see issue #4). Draft HTTP actions:

• POST /api/teams - create new team
• GET /api/teams - list of teams
• GET /api/team/:id - gets specified team
• GET /api/myteam - gets team of currently authenticated user
• DELETE /api/team/:id - delete specified team

[sergeyt]

@BS50 ты что нибудь сделал по этой задаче?