It now includes the shared framework 'name' (NuGet package name) in the installer. In this case, the installer is called '.NET Core Shared Framework (NETStandard.Library 1.0.0-*)'
This causes three pkg files to be produced:
* A component pkg for the shared framework.
* A component pkg for the shared host.
* A product archive which includes the above two components.
The product archive also needs a distribution.xml file which contains
metadata about the package (name, title, images, etc.).
The installer for the "SDK" itself is still using logic implemented in
package-osx.sh. We should move this logic into the build target as well,
but we may want to wait until the CLI is using the shared framework to do so.
