Added EntityComponentPairEqualityComparer. Cleaned tests.
Added Matcher.AllOf()
Removed EntitySetExtension.First()
Improved performance of EntityWillBeRemovedEntityRepositoryObserver
Saved result from performance tests with pretty print
Fixed performance test typo
Removed some extensions. Changed argument order for EntityRepositoryObserver
Removed Flag and Unflag and replaced it with a setter
Added Readme project to ensure correct reference code in README.md
Updated readme and linked to example project