Interestingly, I have just uninstalled the 2015 wizard, and an extracted copy of the .ZIP I had made that remained, suddenly shows up under .NET 4.5 Framework in VS2013.
Also, FWIW, I re-installed both 2014 & 2015 wizards and the former only installs to ..\Documents\Visual Studio 2012\ folder, whereas the latter installs there, as well as ..\Documents\Visual Studio 2013\ folder... However, neither the extracted, nor the new .ZIP are shown under .NET 4.5 Framework again. Grr.