Merge pull request #6 from HappyQuick/develop

add manager.py
Merge pull request #7 from HappyQuick/develop

modify manager.py
Merge pull request #8 from HappyQuick/develop

add function start_role/change_role to player_manager.py
Merge pull request #9 from HappyQuick/develop

delete dice.py/pyc and manager.py/pyc
delete .pyc files

to clean directory