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

* 'master' of github.com:stucsie/stu-online-judge:
  remove non-exist column
  Remove redundant left-brace
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add nl2br
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  改用多行註解並換行避免貼 code 手殘導致編譯錯誤
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Display user name on top navigation
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  修改 Problem Model 新增 created_at 欄位
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  修改錯字
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Link to solution detail page if the solution is WA
  Add isWA method to solutionRow
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Display error message for fail case
  Fix typo
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add nl2br
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add relation: user has one admin
  Fix admin table name
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add isAdmin method to UserRow
Merge branch 'master' of github.com:stucsie/stu-online-judge

* 'master' of github.com:stucsie/stu-online-judge:
  Add created_from column to solution model
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