controllers: move controllers base class from lib/base to controllers TG quickstart put it in lib/base.py , but it fits better on the controllers layer as a base there. The contributing docs were a bit ahead of time ... but with a typo.

pytest >= 4.6.6, < 5.5
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 4.1
Sphinx >= 1.8.0, < 3.1
WebTest >= 2.0.6, < 2.1
isort == 5.1.2
pyflakes == 2.2.0