Added tag auto complete.
Add Notification entity.
Extract file downloading from GetFile action, remove path from infofileviewmodel
Add UserActivityHub.
Add file throttling.
Add implemets of views, creating new filecategory.
Add FileStatistics entity.
Added category views.
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