Add support for receiving multipart responses with attachments#44

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jebbench wants to merge 4 commits intogravity00:Release-v2.xfrom

jebbench:mtom-support

Commits on Nov 23, 2018

Basic implementation with happy path test.
James Bench
committed
Added a model for the XOP Include element.
James Bench
committed

Commits on Nov 26, 2018

Small bit of tidying up.
James Bench
committed
Tidyup dotnet standard 1.1 support (or lack of).
James Bench
committed