Merge pull request #140 from miurahr/fix_travis_error_w_bundler

interim fix for travis error
Merge pull request #138 from miurahr/fix-libvirt-version-error

force libvirt to find qemu
Merge pull request #142 from miurahr/drop_r193_support

Vagrant don't run ruby <2
spec: add kvm box for test Vagrantfile

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
spec: Vagrantfile: fix warning of apt

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
spec: update Vagrantfile comment

- add description of KVM nested virtualization
- add comment for box image for kvm

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
change box url

- Vagrant downloads error with cacert.org certification
- Placed on AWS S3

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
Document: run vagrant-kvm spec on vagrant-kvm.