NUnit 3.0 Beta 3 Release

This is the third beta release of NUnit 3.0. We are planning one more beta next month before the final release.

This release changes the Engine API, so if you have a previous 3.0 release installed, you must uninstall it before installing this release.

For changes to the beta-3 release as well as cumulative changes see the release notes at https://github.com/nunit/nunit/wiki/Release-Notes