Fixing Clean build target.

Author: MiYanni

build.proj

@@ -124,20 +124,18 @@
   <UsingTask Condition=" $(OnPremiseBuild) " TaskName="CorporateValidation" AssemblyFile="$(CIToolsPath)\Microsoft.WindowsAzure.Tools.Build.Tasks.OnPremise.dll" />
   <Import Condition=" $(OnPremiseBuild) " Project="$(CIToolsPath)\Microsoft.WindowsAzure.Build.OnPremise.msbuild" />
 
-  <UsingTask
-    AssemblyFile="$(MSBuildProjectDirectory)\packages\xunit.runner.msbuild.2.1.0\build\portable-net45+win8+wp8+wpa81\xunit.runner.msbuild.dll"
-    TaskName="Xunit.Runner.MSBuild.xunit" />
+  <UsingTask AssemblyFile="$(MSBuildProjectDirectory)\packages\xunit.runner.msbuild.2.1.0\build\portable-net45+win8+wp8+wpa81\xunit.runner.msbuild.dll" TaskName="Xunit.Runner.MSBuild.xunit" />
 
   <!-- Clean the build in all configurations -->
   <Target Name="Clean">
     <Message Importance="high" Text="Cleaning Cmdlets..." />
 
     <!-- Clean out the NuGet cache -->
-    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;$Path = Join-Path $env:USERPROFILE .nuget; if (Test-Path $Path) { Remove-Item $Path -Recurse -Force }&quot;" />
+    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;Remove-Item -Path (Join-Path ($env:USERPROFILE) .nuget packages) -Recurse -Force&quot;" ContinueOnError="WarnAndContinue" />
 
     <!-- Remove Package, Publish, bin, obj, and TestResults directories -->
-    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;Remove-Item -Path $(PackageDirectory),$(PublishDirectory) -Recurse -Force&quot;" />
-    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;Get-ChildItem -Path $(MSBuildThisFileDirectory) -Recurse -Include 'bin','obj','TestResults' | Remove-Item -Recurse -Force&quot;" />
+    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;Remove-Item -Path $(PackageDirectory),$(PublishDirectory) -Recurse -Force&quot;" ContinueOnError="WarnAndContinue" />
+    <Exec Command="$(PowerShellCoreCommandPrefix) &quot;Get-ChildItem -Path $(MSBuildThisFileDirectory) -Recurse -Include 'bin','obj','TestResults' | Remove-Item -Recurse -Force&quot;" ContinueOnError="WarnAndContinue" />
   </Target>
 
   <PropertyGroup>