New Cmdlets: Set-AzureServiceRemoteDesktopExtension, Remove-AzureServiceRemoteDesktopExtension, Get-AzureServiceRemoteDesktopExtension, New-AzureServiceRemoteDesktopExtension
Merge branch 'dev' of https://github.com/huangpf/azure-sdk-tools into dev

Conflicts:
	WindowsAzurePowershell/src/Management.ServiceManagement/Extensions/SetAzureServiceRemoteDesktopExtension.cs
	WindowsAzurePowershell/src/Management.ServiceManagement/Management.ServiceManagement.csproj