Back to .Net 4.5 and MVC 5.1

This is to save your time. Just simple revert back to .Net 4.5 and ASP.MVC 5.1. Orchard has MVC 5.1 in libs, so setting 5.2 brings an exception in Admin panel. .Net 4.5.2 seems to be overkill too, since the rest of the Orchard requires just 4.5.

Thanks for all your help with recent updates!!!