Add Notification entity.
Extract file downloading from GetFile action, remove path from infofileviewmodel
Add UserActivityHub.
Add file throttling.
Add FileStatistics entity.
Add FileStatistics entity.
Merge branch 'Vadzim' of https://github.com/VadzimBura/GroupProject into Vadzim
Merge remote-tracking branch 'remotes/origin/Vika' into Vadzim

Conflicts:
	FileExchange/FileExchange.WebUI/App_Data/FileExchange.mdf
	FileExchange/FileExchange.WebUI/App_Data/FileExchange_log.ldf
	FileExchange/FileExchange.WebUI/Controllers/HomeController.cs
	FileExchange/FileExchange.WebUI/FileExchange.WebUI.csproj
	FileExchange/FileExchange.WebUI/Views/Authorization/SignIn.cshtml
	FileExchange/FileExchange.WebUI/Views/Home/Index.cshtml
	FileExchange/FileExchange.WebUI/Views/Shared/_Layout.cshtml
	FileExchange/FileExchange.v11.suo
Merge remote-tracking branch 'remotes/origin/Slavaa' into Vadzim

Conflicts:
	FileExchange/FileExchange.BLL/Concrete/FileService.cs
	FileExchange/FileExchange.WebUI/Controllers/FileController.cs
	FileExchange/FileExchange.WebUI/Controllers/HomeController.cs
	FileExchange/FileExchange.WebUI/ViewModels/FileViewModel/DownloadFileViewModel.cs
	FileExchange/FileExchange.WebUI/Views/File/AddFile.cshtml
	FileExchange/FileExchange.WebUI/Views/File/AllFiles.cshtml
	FileExchange/FileExchange.v12.suo
Fix bugs after merge
Changed db.
Added view for anonymous user.