add NuGet 1.6 to test data
add NuGet 1.6 to test data

stormleoxia/teamcity-nuget-support,stormleoxia/teamcity-nuget-support,JetBrains/teamcity-nuget-support,stormleoxia/teamcity-nuget-support,JetBrains/teamcity-nuget-support,JetBrains/teamcity-nuget-support,JetBrains/teamcity-nuget-support