Support for semver!

I'm setting appveyor to use the version format "**1.0.0.{build}**" (_Major.Minor.Patch.Build_), which is what I'm using on my extension's manifest. 

However, after the build is done the extension version is changed to the format "Major.Minor.Build"

Tried to modify the script myself, but my Powershell skills didn't help me!

Any ideas?