target refactoring to only use git for nuget release
target refactoring to only use git for nuget release


Former-commit-id: 36cf96495308343fefaf1c55923c1ef5dbf6c5d2
basho/riak-dotnet-client,rob-somerville/riak-dotnet-client,rob-somerville/riak-dotnet-client,basho/riak-dotnet-client