#900 Part 3 - Admin Area

This is the 3rd part of a chain of pull requests that will all be pulled in together. I separated them out to make it easier to review

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The Migration stuff needs an Admin page, so I pulled our admin stuff into an Admin dashboard (~/Admin). It's an MVC area and has a Tab on the home page if you're logged in as an Admin. ELMAH and Dynamic Data are there in this PR, Migrations are added later.