Add tox goodness

.gitignore

@@ -1,2 +1,3 @@
+.tox
 build
 *.pyc

requirements.txt

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+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+pbr>=1.8.0,<1.9.0
+PyYAML>=3.1.0
+simplejson>=2.2.0
+netifaces>=0.10.4
+netaddr>=0.7.12,!=0.7.16
+Jinja2>=2.6  # BSD License (3 clause)
+six>=1.9.0
+dnspython>=1.12.0
+psutil>=1.1.1,<2.0.0
+python-neutronclient>=2.6.0

tox.ini

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+[tox]
+skipsdist = True
+envlist = generate
+
+[testenv]
+setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
+         TERM=linux
+         INTERFACE_PATH={toxinidir}/interfaces
+         LAYER_PATH={toxinidir}/layers
+         JUJU_REPOSITORY={toxinidir}/build
+passenv = http_proxy https_proxy
+install_command =
+  pip install {opts} {packages}
+deps =
+    -r{toxinidir}/requirements.txt
+
+[testenv:generate]
+basepython = python2.7
+commands =
+    charm build --log-level DEBUG -o {toxinidir}/build .
+
+[testenv:venv]
+commands = {posargs}
+
+[testenv:lint]
+basepython = python2.7
+commands = flake8 {posargs} charm/reactive charm/lib