Use tox, use codecov, work around pypy3 issues.

tox.ini

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+[tox]
+envlist = py26,py27,py33,py34,py35,py36,py37,jython,pypy,pypy3,cov,type,lint
+skipsdist = true
+skip_missing_interpreters = true
+
+[testenv]
+deps = 
+	pytest==3.0.7
+	coverage==4.3.4
+	colorama==0.3.7
+setenv =
+	SSHAUDIT = {toxinidir}/ssh-audit.py
+	COVERAGE_FILE = {toxinidir}/.coverage.{envname}
+commands =
+	coverage run --source ssh-audit -m -- pytest -v {posargs:test}
+	coverage report --show-missing
+	coverage html -d {toxinidir}/html/coverage.{envname}
+
+[testenv:cov]
+deps =
+	coverage==4.3.4
+setenv =
+	COVERAGE_FILE = {toxinidir}/.coverage
+commands =
+	coverage erase
+	coverage combine
+	coverage report --show-missing
+	coverage html -d {toxinidir}/html/coverage
+ignore_outcome = true
+
+[testenv:mypy]
+basepython =
+	{env:MYPYBASE:python3.5}
+deps =
+	colorama==0.3.7
+	mypy==0.501
+	lxml==3.7.3
+setenv =
+	{[testenv]setenv}
+	MYPYPATH = {toxinidir}/test/stubs
+	MYPYHTML = {toxinidir}/html/mypy
+commands =
+	mypy \
+		--show-error-context \
+		--config-file {toxinidir}/tox.ini \
+		--html-report {env:MYPYHTML}.py3 \
+		{posargs:{env:SSHAUDIT}}
+	mypy \
+		-2 \
+		--no-warn-incomplete-stub \
+		--show-error-context \
+		--config-file {toxinidir}/tox.ini \
+		--html-report {env:MYPYHTML}.py2 \
+		{posargs:{env:SSHAUDIT}}
+
+[testenv:pylint]
+deps =
+	mccabe
+	pylint
+commands =
+	pylint \
+		--rcfile tox.ini \
+		--load-plugins=pylint.extensions.bad_builtin \
+		--load-plugins=pylint.extensions.check_elif \
+		--load-plugins=pylint.extensions.mccabe \
+		{posargs:{env:SSHAUDIT}}
+
+[testenv:flake8]
+deps =
+	flake8
+commands =
+	flake8 {posargs:{env:SSHAUDIT}}
+
+[testenv:vulture]
+deps = vulture
+commands =
+	python -c "import sys; from subprocess import Popen, PIPE; \
+		a = ['vulture'] + r'{posargs:{env:SSHAUDIT}}'.split(' '); \
+		o = Popen(a, shell=False, stdout=PIPE).communicate()[0]; \
+		l = [x for x in o.split('\n') if x and 'Unused import' not in x]; \
+		print('\n'.join(l)); \
+		sys.exit(1 if len(l) > 0 else 0)"
+
+[testenv:type]
+basepython =
+	{[testenv:mypy]basepython}
+deps =
+	{[testenv:mypy]deps}
+setenv =
+	{[testenv:mypy]setenv}
+commands =
+	{[testenv:mypy]commands}
+ignore_outcome = true
+
+[testenv:lint]
+deps =
+	{[testenv:pylint]deps}
+	{[testenv:flake8]deps}
+	{[testenv:vulture]deps}
+commands =
+	{[testenv:pylint]commands}
+	{[testenv:flake8]commands}
+	{[testenv:vulture]commands}
+ignore_outcome = true
+
+
+[mypy]
+ignore_missing_imports = False
+follow_imports = error
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+check_untyped_defs = True
+disallow_subclassing_any = True
+warn_incomplete_stub = True
+warn_redundant_casts = True
+warn_return_any = True
+warn_unused_ignores = True
+strict_optional = True
+#strict_boolean = False
+
+[pylint]
+reports = no
+#output-format = colorized
+indent-string = \t
+disable = locally-disabled, bad-continuation, multiple-imports, invalid-name, trailing-whitespace, missing-docstring
+max-complexity = 15
+max-args = 8
+max-locals = 20
+max-returns = 6
+max-branches = 15
+max-statements = 60
+max-parents = 7
+max-attributes = 8
+min-public-methods = 1
+max-public-methods = 20
+max-bool-expr = 5
+max-nested-blocks = 6
+max-line-length = 80
+ignore-long-lines = ^\s*(#\s+type:\s+.*|[A-Z0-9_]+\s+=\s+.*|('.*':\s+)?\[.*\],?)$
+max-module-lines = 2500
+
+[flake8]
+ignore =
+	# indentation contains tabs
+	W191,
+	# blank line contains whitespace
+	W293,
+	# indentation contains mixed spaces and tabs
+	E101,
+	# multiple spaces before operator
+	E221,
+	# multiple spaces after operator
+	E241,
+	# multiple imports on one line
+	E401,
+	# line too long
+	E501,
+	# module imported but unused
+	F401,
+	# undefined name
+	F821