Kvm shell implementation

Bash KVM implementation for non windows platforms. Currently does not support global installations. Architecture and platform flags are not implemented as there is only a single arch and platform for non windows platforms.

KVM and the  latest K Runtime Environment can be installed by running:

```bash
curl https://raw.githubusercontent.com/graemechristie/Home/KvmShellImplementation/kvmsetup.sh | sh && source ~/.kre/kvm/kvm.sh && kvm upgrade
```

Based on the implementation of nvm at https://github.com/creationix/nvm