(GH-460) Amended Template

Using 'choco new' to produce ChocolateyUninstall.ps1 for your package would result in the uninstall block never being executed as the $key variable type was wrong. Updated the script template to force the $key variable to always be an array and therefore have a Count method that can be evaluated and the uninstall block executed.

Closes #460

src/chocolatey/infrastructure.app/templates/ChocolateyUninstallTemplate.cs

@@ -58,7 +58,7 @@ public class ChocolateyUninstallTemplate
 $machine_key   = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
 $machine_key6432 = 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'
 
-$key = Get-ItemProperty -Path @($machine_key6432,$machine_key, $local_key) `
+[array]$key = Get-ItemProperty -Path @($machine_key6432,$machine_key, $local_key) `
                         -ErrorAction SilentlyContinue `
          | ? { $_.DisplayName -like ""$softwareName"" }