批量添加用户的功能
no message
Merge branch 'master' of https://github.com/PIPOSKY-DEV-TEAM/PIPOSKY2

Conflicts:
	PIPOSKY2/Controllers/ProblemController.cs
	PIPOSKY2/PIPOSKY2.csproj
	PIPOSKY2/Views/Problem/Content.cshtml
	PIPOSKY2/Views/Problem/Index.cshtml
	PIPOSKY2/Views/Problem/Upload.cshtml
修复了Controller的引用
Merge branch 'master' of https://github.com/PIPOSKY-DEV-TEAM/PIPOSKY2

Conflicts:
	PIPOSKY2/Controllers/UserController.cs
	PIPOSKY2/PIPOSKY2.csproj
Merge branch 'master' of https://github.com/PIPOSKY-DEV-TEAM/PIPOSKY2

Conflicts:
	PIPOSKY2/PIPOSKY2.csproj
用户管理，删除用户，修改用户类型
Merge branch 'master' of https://github.com/PIPOSKY-DEV-TEAM/PIPOSKY2

Conflicts:
	PIPOSKY2/Controllers/ContestController.cs
	PIPOSKY2/Controllers/ProblemController.cs
	PIPOSKY2/PIPOSKY2.csproj
	PIPOSKY2/Views/Problem/Content.cshtml
	PIPOSKY2/Views/Problem/Delete.cshtml
	PIPOSKY2/Views/Problem/Index.cshtml
	PIPOSKY2/Views/Problem/Upload.cshtml
Merge branch 'master' of https://github.com/PIPOSKY-DEV-TEAM/PIPOSKY2