Add tox support

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>

requirements.txt

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+termcolor
+pyyaml

test-requirements.txt

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+flake8>=2.5.0

tox.ini

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+[tox]
+minversion = 1.9
+envlist = py3,pep8
+skipsdist = True
+toxworkdir = {env:TOXWORKDIR:.tox}
+
+[testenv]
+setenv =
+	PYTHONPATH = {env:PYTHONPATH:}
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+whitelist_externals = bash
+changedir = tests
+commands = bash ./test.bash -t
+
+[testenv:pep8]
+commands = flake8 --ignore=E123,E125
+
+[flake8]
+# E123, E125 skipped as they are invalid PEP-8.
+
+show-source = True
+ignore = E123,E125
+builtins = _
+exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+
+[testenv:pylint-errors]
+deps = pylint >= 1.6
+commands = pylint -f colorized -E barectf
+
+[testenv:pylint-warnings]
+deps = pylint >= 1.6
+commands = pylint -f colorized -d all -e W -r n barectf
+
+[testenv:pylint-full]
+deps = pylint >= 1.6
+commands = pylint -f colorized --disable=all -e R,E,W barectf