update outdated libraries

[aodag]

certifi (2017.4.17) - Latest: 2018.1.18 [wheel]
coverage (4.4.1) - Latest: 4.4.2 [wheel]
idna (2.5) - Latest: 2.6 [wheel]
py (1.4.34) - Latest: 1.5.2 [wheel]
pytest (3.1.3) - Latest: 3.3.2 [wheel]
requests (2.18.1) - Latest: 2.18.4 [wheel]
six (1.10.0) - Latest: 1.11.0 [wheel]
testfixtures (5.1.1) - Latest: 5.4.0 [wheel]
urllib3 (1.21.1) - Latest: 1.22 [wheel]
waitress (1.0.2) - Latest: 1.1.0 [wheel]
WebOb (1.7.3) - Latest: 1.7.4 [wheel]
WebTest (2.0.27) - Latest: 2.0.29 [wheel]