tests: introduce more test coverage of whoosh filtering This has been extracted from other changesets by Mads Kiilerich to establish a test baseline so we clearly can see what the following fixes are fixing. Some of these tests will thus demonstrate bad behaviour - that will be fixed later.

pytest ~= 3.0
pytest-runner
pytest-sugar>=0.7.0
pytest-catchlog
WebTest<2 # this is also a Pylons dependency and pinned in setup.py to avoid version conflicts for WebOb
mock
sphinx