Modify install batch to use vswhere.

install-VS2017.bat

@@ -1,3 +1,28 @@
 @echo off
+cls
 
-powershell -File install-VS2017.ps1 %1 %2 %3 %4 %5 %6 %7 %8 %9
+set NuGet=Build\Tools\nuget.exe
+set VSWhere=Build\Tools\vswhere.exe
+
+goto :MSBuild
+
+:NuGet
+echo Running NuGet restore
+%NuGet% restore Builder.sln
+%NuGet% restore Cosmos.sln
+
+:MSBuild
+echo Looking for MSBuild
+for /f "usebackq tokens=1* delims=: " %%i in (`%VSWhere% -latest -version "[15.0,16.0)" -requires "Microsoft.Component.MSBuild" -property "installationPath"`) do (
+  set InstallDir=%%j
+)
+
+if exist "%InstallDir%\MSBuild\15.0\Bin\MSBuild.exe" (
+  set MSBuild="%InstallDir%\MSBuild\15.0\Bin\MSBuild.exe"
+)
+
+if exist %MSBuild% (
+  %MSBuild% Builder.sln /nologo /maxcpucount /p:Configuration="Debug" /p:Platform="Any CPU"
+)
+
+"source\Cosmos.Build.Builder\bin\Debug\Cosmos.Build.Builder.exe" "-bat" "-VS2017" "%InstallDir%"