Implemented -a/-alias switch to set alias on install for kvm.ps1
Updated help for kvm.ps1 with text for new -alias switch
implemeted -alias switch for kvm install command in kvm.sh
Fixed bug where alias of '' was being created on all install commands without alias set
Merge pull request #363 from graemechristie/implement-kvm-alias-switch

Implement kvm alias switch