add support for passed arguments

Add environment variable SuiteArgs that can be used to pass arguments to
powershell.  For example
set SuiteArgs=-verbose
will set powershell execution output to verbose

build.cmd

@@ -41,7 +41,7 @@
 @SET DeploymentScripts=%~dp0\Common\Deployment
 @SET BuildPath=%~dp0Build_Output\%Configuration%
 @SET PowerShellCmd=%windir%\system32\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Unrestricted -Command
-@SET PublishCmd=%PowerShellCmd% %DeploymentScripts%\PrepareIoTSample.ps1 -environmentName %EnvironmentName% -configuration %Configuration%
+@SET PublishCmd=%PowerShellCmd% %DeploymentScripts%\PrepareIoTSample.ps1 -environmentName %EnvironmentName% -configuration %Configuration% %SuiteArgs%
 
 @IF /I '%AzureEnvironmentName%' NEQ '' (
     Set PublishCmd=%PublishCmd% -azureEnvironmentName %AzureEnvironmentName%