Add two field for Problem model
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  JudgeJob.phpAdd two field for Problem model
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add sample input/output column to problem model
修改 Problem Model
刪除 source_code & answer 欄位