Added ServiceMaintence error-code exception factory.
Created exception for situation when some request sended to wykop api is invalid - InvalidWykopApiRequestException.

Created factory class for creating exception to handle InvalidApiKey error code.
Removed WykopUserNotLoggedInException.

Added information about: RequestUrl in WykopApiException.
Changed ExceptionFactory interface.
WykopApiExceptionFactoryAttribute now could be used multiple @ on target (class).

Changed WykopApiExceptionFactory interface - now error code is passed (due to changes in attribute - one exception could describe multiple error codes).
Implemented WykopApiException Factory class with reflection.
Merge branch 'ErrorCodesExceptions' into dev