Freeze dependency constraints.
Fix build.
Add OnlineJudge.hs.
Add Submit.hs.
Implement Aoj.fetch.
Merge pull request #6 from chiro/freeze-deps

Freeze dependency constraints.
Merge pull request #5 from chiro/aoj

AOJに提出する機能の実装
modify .gitignore
change the type of pid from Int to String.