v1.0.0-rc.2

This is the second release candidate for this package before the 1.0 release. The minimum requirements were to implement an Sftp server that could be stood up for testing, and allow files to be added or removed as needed.

The focus of this release was to clean up exposed api's before our first release.

Changes since the last release include:

• Replacing KeyValuePair with an Option class
• Separated Container and Network gateway functionality
• Added a boolean to the Run attribute to signify whether the test environment should be torn down after the tests complete
• Implemented our own IAsyncLifetime so we could drop the Xunit dependency from the main library
• Optimized tests to run quicker
• Added ConfigureAwait(false) to awaits to avoid deadlocks