Fix for Patch extension

Fixes #17

MultipartContent support

Support for submitting multipartcontent requests.
Fixes #13

Fixed Bug on RequestContext

Bug was found on the BeforeRequest event where the RequestContext was not being populated correctly. #14

Found when working on multipart custom client experiment.
Added tests

Dotnet Standard support and a few fixes

Migrated RestFluencing.Core and RestFluencing.JsonSchema to allow .Net Framework 4.5 and DotnetStandard2 #9

Refactored the HttpApiClient to help extending it. #8

Merged the Response Headers with the Content Headers #10

Added Patch extension to the RestConfigration #10

Added the appveyor.yml to the code.

bug fix for response headers

0.9.2

Merge branch 'master' of https://github.com/djmnz/RestFluencing

0.9.0

added model sample to example