add test for correct child-versions display

Add a cucumber integration test to display
the right ontology-versions in the tab for
child-ontology versions.
avoid mocha deprecation warnings

This also deactivates mocha entirely for rspec
and uses rspec-mocks explicitly instead.
improve handling of files and parsing in rspec.
fix cleaning of redis during rspec runs.
fix the ontology-version controller spec

Now we actually check for assignments of
child-versions.
translate ontology_version test to rspec.
silence shell-output from git-repo factory.