Added a Xamarin.iOS Archiving helper
Merge pull request #581 from chrisriesgo/xamarin-ios-archive

Added a Xamarin.iOS Archiving helper
RELEASE_NOTES
Bump version to 3.8.5
use fsianycpu.exe instead of fsi.exe.
use fsianycpu.exe instead of fsi.exe. (reverted from commit 6a28f891f0e40b9ba0764d3e54d89fab06121bff)
Create an additional 64 bit nuget package, where corflags for Fake.exe are modified.