Deleted PSake build files to depend totally on AppVoyer build setup
Deleted EF6 debugging interceptor. It was part of integration tests that I didn't import into this solution.

It was implemented only as a proof of concept for Retry policy.
Minor refactor for UnitOfWorkPlayer
Merge pull request #3 from waheedsayed/cleanup

Enough refactoring. AppVoyer settings are ready. Let's see how it goes. :shipit: