Feature/nonstringheaders

We are using an NServiceBus endpoint as a consumer downstream from a producer that is on a different cluster. Messages are routed over to the consumer's cluster using the RabbitMQ Federation plugin. The federation plugin adds a header called x-received-from that is a table of key-value pairs itself. This patch adds the ability to read headers of types array and dictionary.

Also bumped up the GitFlowVersion fody extension version because 0.1.13 was throwing exceptions on my feature branch name.