Add support for tox

Author: msabramo

MANIFEST.in

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+include README.rst

tox.ini

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+[tox]
+envlist = py26, py27, py33, py34, pypy, pypy3, flake8
+
+[testenv]
+deps =
+    pytest
+    pytest-cov
+commands =
+    py.test {posargs}
+
+[testenv:flake8]
+basepython = python2.6
+deps =
+    flake8
+commands =
+    flake8 docverter.py test_docverter.py