Fix linting security warnings and Python 3.3/3.4 test failures #504

Job	Run time
Create sdist and Python 3 Wheel	32s
Create Python 2 Wheel	2m 22s
Test Documentation	32s
Test Typing (sdist)	38s
Test Typing (wheel)	2m 5s
Test Package (2.7, wheel)	17s
Test Package (3.4, sdist)	21s
Test Package (3.3, sdist)	20s
Test Package (3.3, wheel)	22s
Test Package (3.7, sdist)	20s
Test Package (3.5, sdist)	17s
Test Package (3.6, sdist)	17s
Test Package (3.4, wheel)	17s
Test Package (2.7, sdist)	16s
Test Package (3.6, wheel)	22s
Test Package (3.9, wheel)	28s
Test Package (3.12, wheel)	28s
Test Package (3.8, wheel)	17s
Test Package (3.10, wheel)	26s
Test Package (3.8, sdist)	20s
Test Package (3.12, sdist)	30s
Test Package (3.9, sdist)	27s
Test Package (3.11, wheel)	25s
Test Package (3.7, wheel)	20s
Test Package (3.13, wheel)	28s
Test Package (3.5, wheel)	17s
Test Package (3.13, sdist)	29s
Test Package (3.11, sdist)	27s
Test Package (3.10, sdist)	31s
	15m 11s

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