Make Location optional in NewAzureSBNamespace cmdlet
WindowsAzure#1336
Add scenario test
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into 1336

Conflicts:
	WindowsAzurePowershell/src/Management.ScenarioTest/ServiceBusTests/ServiceBusNamespaceTests.cs
Merge pull request #1599 from ogail/1336

Make Location optional in NewAzureSBNamespace cmdlet