Bugfix media cache property alias case sensitivity
U4-4837 - bugfix Umbraco.Core.EnumerableExtensions.InGroupsOf
I was confused, these files exist just fine :)
Update the install ps to do logging of copies and to actually copy the /umbraco folder properly
Merge branch '7.1.2' of https://github.com/umbraco/Umbraco-CMS into 7.1.2