Remove cucumis tests, it is uninstallable and does not work

Cucumis has not been updated since QA Dashboard was implemented. It is
not installed properly by npm and it does not even run due to submodule
problem.
Ditch monmon, use mongodb-wrapper

Reasons behind this include:
- monmon is not maintained (methods do not correspond with methods
  supported by the latest mongodb-native)
- tests failed randomly using the latest mongodb-native
- monmon is not documented
- mongodb-wrapper is maintained, documented, and syntaxwise close
  to what monmon was