Add the author of the original PR of a patch inconsistencies checker

The implementation is conceptually based on another PR,
but it was heavily reworked to a forked repo, which went far ahead,
and the implementation is significantly changed:

* Instead of the RFC patch simulation locally, a one-way diff is used
  to check if the selected fields of the response
  are different from what is intended in the patch.
  Other fields and changes are ignored.
* The patch-vs-response check is also performed in daemons/timers.
* The tests are different.

CONTRIBUTORS.md

@@ -11,6 +11,7 @@ and [Historic GitHub Contributors](https://github.com/zalando-incubator/kopf/gra
 - [Daniel Middlecote](https://github.com/dlmiddlecote)
 - [Henning Jacobs](https://github.com/hjacobs)
 - [Ismail Kaboubi](https://github.com/smileisak)
+- [Michael Narodovitch](https://github.com/michaelnarodovitch)
 - [Sergey Vasilyev](https://github.com/nolar)
 - [Soroosh Sarabadani](https://github.com/psycho-ir)
 - [Trond Hindenes](https://github.com/trondhindenes)