Extract file downloading in file service, add user downloading rate limit
Fix bugs after merge
Added view for anonymous user.
Begin with comments.
Merge remote-tracking branch 'remotes/origin/Vika' into Vadzim

Conflicts:
	FileExchange/FileExchange.BLL/Concrete/FileService.cs
	FileExchange/FileExchange.BLL/Interfaces/IFileService.cs
	FileExchange/FileExchange.WebUI/App_Data/FileExchange.mdf
	FileExchange/FileExchange.WebUI/App_Data/FileExchange_log.ldf
	FileExchange/FileExchange.WebUI/App_Start/AutomapperConfig.cs
	FileExchange/FileExchange.WebUI/FileExchange.WebUI.csproj
	FileExchange/FileExchange.v11.suo
Add comments and api for file subscriptions.
Finish with email notification.
Added views.
Finish with email notification.
Merge branch 'Vadzim' of https://github.com/VadzimBura/GroupProject into Vadzim

Conflicts:
	FileExchange/FileExchange.v11.suo
Merge remote-tracking branch 'remotes/origin/Vika' into Vadzim

Conflicts:
	FileExchange/FileExchange.BLL/Concrete/AdminService.cs
	FileExchange/FileExchange.DAL/Entities/User.cs
	FileExchange/FileExchange.WebUI/App_Data/FileExchange.mdf
	FileExchange/FileExchange.WebUI/App_Data/FileExchange_log.ldf
	FileExchange/FileExchange.WebUI/App_Start/BundleConfig.cs
	FileExchange/FileExchange.WebUI/Controllers/AdminController.cs
	FileExchange/FileExchange.WebUI/Controllers/AuthorizationController.cs
	FileExchange/FileExchange.WebUI/Controllers/FileController.cs
	FileExchange/FileExchange.WebUI/Views/File/FileDetails.cshtml
	FileExchange/FileExchange.WebUI/Views/Shared/_Layout.cshtml
	FileExchange/FileExchange.v11.suo
Fix bug with styles.
Added functions to api controllers for get by id and put data.
Add migrations.
Crazy merge
Added file statistics.
Rewrite file managing
Added logic for getting tags information.
Add tags autocomplete.
Merge remote-tracking branch 'remotes/origin/Vika' into Vadzim

Conflicts:
	FileExchange/FileExchange.BLL/Concrete/FileService.cs
	FileExchange/FileExchange.BLL/Interfaces/IFileService.cs
	FileExchange/FileExchange.WebUI/App_Data/FileExchange.mdf
	FileExchange/FileExchange.WebUI/App_Data/FileExchange_log.ldf
	FileExchange/FileExchange.WebUI/App_Start/AutomapperConfig.cs
	FileExchange/FileExchange.WebUI/App_Start/BundleConfig.cs
	FileExchange/FileExchange.WebUI/Controllers/AdminController.cs
	FileExchange/FileExchange.WebUI/FileExchange.WebUI.csproj
	FileExchange/FileExchange.WebUI/Views/Shared/_Layout.cshtml
	FileExchange/FileExchange.v11.suo
	FileExchange/FileExchange.v12.suo