Install packer 0.12.1, vagrant 1.9.1

hyperv/scripts/install-packer.ps1

-$ProgressPreference = 'SilentlyContinue'
-if (Test-Path $env:TEMP\packer.zip) {
-  rm -force $env:TEMP\packer.zip
-}
-if (Test-Path $env:TEMP\packer) {
-  rm -recurse -force $env:TEMP\packer
-}
-wget -outfile $env:TEMP\packer.zip -uri https://dl.bintray.com/taliesins/Packer/Packer.1.0.0.145-HyperV.nupkg -UseBasicParsing
-Expand-Archive $env:TEMP\packer.zip -DestinationPath $env:TEMP\packer
-copy $env:TEMP\packer\packer.exe $env:ChocolateyInstall\bin\packer.exe
-rm -force $env:TEMP\packer.zip
+choco install -y packer -version 0.12.1

hyperv/scripts/install-vagrant.ps1

-choco install -y vagrant -version 1.8.7
+choco install -y vagrant -version 1.9.1