Build Script usage of comparison function bug

[DonkeyShoot]

Issue Description

The function in the powershell build script is called as follows (line 38):
If (CompareVersions -actualVersion $vboxVersion -expectedVersion $virtualBoxMinVersion --exactMatch $False)
which sets the value of exactMath to "--exactMatch" instead of $False.

The correct usage is:
If (CompareVersions -actualVersion $vboxVersion -expectedVersion $virtualBoxMinVersion -exactMatch $False)

Secondly, I had to manually install the guest additions for virtualbox to make the shared folder link work for the vagrant scripts.

[jbarnett-r7]

This one was fixed with PR #79. Please try grabbing the latest code and see if that fixes it for you. Let us know if you're still seeing issues.