Add tox-based tests support

Change-Id: I01715ba96a062e7a297b3f8ccbbbcbb7bff83763

test-requirements.txt

@@ -0,0 +1,4 @@
+hacking
+sphinx
+nose
+coverage

tox.ini

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+[tox]
+envlist = py26,py27,pep8
+minversion = 1.6
+skipsdist = True
+
+[testenv]
+usedevelop = True
+install_command = pip install {opts} {packages}
+deps =
+  https://launchpad.net/swift/icehouse/1.13.0/+download/swift-1.13.0.tar.gz
+  -r{toxinidir}/test-requirements.txt
+commands = nosetests {posargs:swift3/test/unit}
+setenv = VIRTUAL_ENV={envdir}
+
+[testenv:pep8]
+commands = flake8
+
+[testenv:venv]
+commands = {posargs}
+
+[testenv:cover]
+setenv = VIRTUAL_ENV={envdir}
+         NOSE_WITH_COVERAGE=1
+         NOSE_COVER_PACKAGE=swift3
+
+[tox:jenkins]
+downloadcache = ~/cache/pip
+
+[flake8]
+# follow the same style guidelines with swift
+ignore = H
+select = H102,H103,H201,H501,H903
+exclude = .venv,.git,.tox,dist,doc,*egg,build
+show-source = True