Initial commit on develop branch
- Created the 'lib/wot-api/player' folder, where to put files
  that belong to `Wot::Player` namespace.
- Created the infrastructure for `Wot::Player` namespace.
- Updated library version.
Refactor `Wot::Player` namespace and `Wot::Api` methods
- Refactor `Wot::Player::Info`.
- Refactor `Wot::Player::Statistics`.
- Removed useless files.
- `Wot::Error` class now extends `StandardError`.
- Now, instead of returning an `Wot::Error` object, `Wot::Api::make_request`
  will raise and `Wot::Error` exception.
Refactor player tanks method
- Implemented Wot::Player::Tank class, that contains some data
  about player's tank.
- Used Wot::Player::Tank class to represent player's tanks, instead
  of Vehicle, that should contain complete data about a tank, and,
  furthermore, should be renamed to Tank.
- Renamed and changed Wot::Api.player_vehicles method.
- Removed useless methods from Parser class.
Refactor player achievements functionality
- Implemented Wot::Player::Achievement class.
- Used Wot::Player::Achievement class instead of Wot::Achievement.
- Removed useless files and methods.
Remove useless class and left only esential for player
- Removed classes which functionalities can be moved into
  another classes
- Left only the functionalities esential for getting information
  about interested players
- Used autoload instead of require