Version 2.0.0.

Merge pull request #7 from DanRigby/housekeeping

Project updates and cleanup

- Update packages
- Fix code warnings
- Ensure tests are passing
- Cleanup project file contents
- Add SDK multi-targeting
- Switch to xUnit
- Fix tests to work regardless of system newline format

Fix bad rename on JsonFeedItem.

v0.2.0

* Remove the prerelease tag from the package.
* Prefixed the class names with JsonFeed to avoid any naming collisions.
* Added xml documentation for the API methods.
* Added an API for writing directly to a stream.
* Updated samples in the Readme file.

Update README.md

* Add project information & links
* Add sample usage