Ignore __pycache__, build and dist folders
Forbid running setup with Python2
Fixed problem with missed packages
Added base class for json objects
Added implementation for Problem
Added implementation for ProblemStatistics
Added implementation for Contest
Added implementation for contest.list, contest.standings and problemset.problems methods
Added example (loading Div.2 'C' problems)
Fixed import error
Merge branch 'dev' into examples
Added readme to examples.
Added implementation for User object
Refactoring: field loading method split into two: for loading required and optional fields
Fixes #2
Added implementation for user.info method
Merge branch 'dev' into examples
Added example (loading users by handles)
Added doc comments to methods
Changed *args to tags parameter in problemset_problems method
Merge branch 'dev' into examples