Update README.md & README_API.md

We actually need to use the bin/carton wrapper on the VM because we want the libs to be installed to a non-standard location.  This is because of how the folder mappings work.  If we don't to this then the carton libs are just installed to the same folder as the repository, which is on the host.  However, we want libs installed on the guest (the VM) so that when we bundle a new VM it already comes with all of the libs installed.  That saves a fair amount of time when getting started.