* update AWS-SDK to 2.3.6.0
* fix
* adjusted to latest AWS SDK changes

- no timeout for file downloads
* removed nuget package binaries (because we use package restore)
* updated .gitignore file to exclude nuget package sub
* update NUnit and remove it from the tools subfolder
* updated readme
Merge pull request #4 from makomweb/martin/update-AWS-SDK-dependencies

Update AWSSDK dependencies + fixed AppVeyor