Fix various coding weidness discovered during the Checkmate review

Via 3 was used as the base for Checkmate and during that review a number of weird things were discovered:

* The routing should be moved to `route.py` instead of being in the views.
* The requirements.in files should not have any version numbers
* The status end-point can use much simpler ways of returning a nice response
* We should import `view_decorator` directly instead of the module