docs: remove some references to Pylons These references are either not used, or do not provide value. The Windows installation and email pages still references documents from the Pylons website -- alternative pages from Turbogears2 need to be found.

pytest>=2.7.0,<4.0
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