Fixed API for character

[Virako]

Everything in character work bad. We need fixed character API, this API should be similar to things API.

• character/npc/ API REST
• character/player/ API REST

For create NPC or Player, we should use deserializers, I think so we should create UserSerializer for create User (similar to Preferences in Game in file: game/serializers.py +20 ). The API call is the following:

• POST character/npc/

#way1: user was created previously
params: {
  'user': user_pk
}

#way2: user will be created in deserializer
params: {
  'user': {
    'email': valid_email,
    'password': pwd
  }
}

[Virako]

PR: #19