Travis test script does not lint

[gwarmstrong]

The travis test script:

regression-benchmarking/.travis.yml

Lines 21 to 23 in 808a6d0

	script:
	- make test-cov
	after_success:

Does not call make lint:

regression-benchmarking/Makefile

Lines 7 to 10 in 808a6d0

	lint:
	q2lint
	flake8

As a result, there are a number of miscellaneous style violations floating around the repo