surround transaction at seed
[team] add validates
[team] refactor seed
Merge branch 'team'
[team] define NPB::Team#param method
Merge branch 'team'
[game] define NPB::Game#param
[game] add validates
Merge branch 'game'
[team_result] scaffold
[team_result] add validates
[team_result] association
[team_result] rewrite validates
[team_result] create team_result at seed file
Merge branch 'team_result'
[game] add index
Merge branch 'game'
[team] add index
Merge branch 'team'
[player] Scaffold