Forget a self after refactorization.
Convert _is_int to a function.
RequestFinder is a new class object.
Rename _is_new_review_by_project to _new_review...

_new_review_by_project do not return True / False, but the staging
project that is reviewing the request and that is in new state.
Formalize the definition of supersede
Merge pull request #113 from aplanas/master

Formalize the definition of supersede