Add ToolsRoot so Chocolatey_Bin_Root is \tools

ToolsRoot/tools/chocolateyUninstall.ps1

@@ -0,0 +1,23 @@
+$package = 'ToolsRoot'
+
+try
+{
+  $variableName = 'Chocolatey_Bin_Root'
+  $binRoot = Get-Item Env:$variableName -ErrorAction SilentlyContinue |
+    Select -ExpandProperty Value -First 1
+
+  if ($binRoot)
+  {
+    [Environment]::SetEnvironmentVariable($variableName, '', 'User')
+    Set-Item Env:$variableName $null
+
+    Write-Host "Removed $variableName [was $binRoot]"
+  }
+
+  Write-ChocolateySuccess $package
+}
+catch
+{
+  Write-ChocolateyFailure $package "$($_.Exception.Message)"
+  throw
+}