AKA (for google-fu):
asp.net mvc 5 web site administration tool
asp.net mvc 5 web configuration tool
asp.net mvc 5 identity
asp.net mvc 5 membership
I have missed the asp.net Web Site Administration Tool that used to be included with Visual Studio. I created an alternative for asp.net mvc 4 you can find here.
For asp.net mvc 5, I created an Azure Site Extension to provide the same functionality. It can be run from VS on your local machine as well as installed as a site extension on Azure.
github repo: https://github.com/Stonefinch/AspNetUserMaintenanceAzureSiteExtension
Hope this helps,