Result of a discussion with @qiangxue
- there is not global Yii::$app->response anymore, every action has
  dedicated response class
- implementation allows using HMVC pattern now, nested actions do not
  interfer

Name make more sense imo as it is not clear what it handles otherwise.
Removed unused method processRequest form console app and also refactored
console Application to be more similar to web Application.

Added support for different response formats.
Support for error response in different formats.

load ErrorException manually because autoloading them will not work
when error occurs while autoloading a class

added decimalSeparator and thousandSeparator properties.
issue #48