Make tags parameter optional
Merge branch 'dev' into examples
Added implementation for method user.ratedList
Added implementation for Member object
Added implementation for Party object
Added implementation for Submission object
Added implementation for user.status method
Refactoring: removed redundant check
Merge branch 'dev' into examples
Implemented __eq__ and __hash__ methods for BaseJsonObject
Merge branch 'dev' into examples
Changed order of submission and added checking for already solved problems
Added example (show only unsolved problems)