Adding Test cases for Domain Join extesion cmdlets
Get-AzureServiceExtensionImage impl.
Adding test cases for 2186,2187,2145
Implemented comments on "Adding test cases for 2186,2187,2145" commit.
Merge branch 'dev' of https://github.com/AzureRT/azure-sdk-tools into dev
Merge branch 'dev' of https://github.com/huangpf/azure-sdk-tools into extensions
Remove unused references
Update AutoMapper nuget version
Update libraries in solution
Update Configuration Manager NuGet
Adding test cases for Static CA cmdlets
Merge branch 'dev' of https://github.com/huangpf/azure-sdk-tools into extensions
Merge branch 'azurert' of https://github.com/huangpf/azure-sdk-tools into extensions
Merge branch 'extensions' of https://github.com/huangpf/azure-sdk-tools into extensions
PGA + ReferenceExtension
VMA extension
Fix nullable type issue for ResourceExtensionParameterValue
Address WAML packages issue
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into extensions

Conflicts:
	WindowsAzurePowershell/src/Commands.ServiceManagement.PlatformImageRepository/Commands.ServiceManagement.PlatformImageRepository.csproj
	WindowsAzurePowershell/src/Commands.ServiceManagement.Preview/Commands.ServiceManagement.Preview.csproj
	WindowsAzurePowershell/src/Commands.ServiceManagement/Commands.ServiceManagement.csproj
	WindowsAzurePowershell/src/Commands.Test.Utilities/packages.config
	WindowsAzurePowershell/src/Commands.Test/packages.config
	WindowsAzurePowershell/src/Commands.Utilities/packages.config
DisableGuestAgent option for Add-AzureProvisioningConfig cmdlet