Missed '?' on query for Windows 8.1
Updated to PowerShell 5 September 2014 preview.
Merge pull request #24 from juliandunn/powershell5-sept2014

Updated to PowerShell 5 September 2014 preview.
Merge pull request #23 from juliandunn/powershell5-fix

Missed '?' on query for Windows 8.1