add comments.
set proper switches.
add a comment header.
move params to qemu-kvm.sh.
move qemu_kvm_path to qemu-kvm.sh.
add qemu_command to qemu-kvm.sh.
add a default value to "offset".
use qemu-kvm.sh.
remove eval.
add attach_vif_to_bridge to qemu-kvm.sh.
remove unnecessary comment.
add a new line.
Merge pull request #162 from wakameci/kvm-script

Kvm script