Added tox for testing

tox.ini

@@ -0,0 +1,55 @@
+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py27, py33, py34, pypy, cover, flake8, pylint
+
+[testenv]
+commands = nosetests
+
+deps =
+    nose
+
+[testenv:py27]
+deps =
+    {[testenv]deps}
+
+[testenv:pypy]
+deps =
+    {[testenv]deps}
+
+[testenv:cover]
+basepython = python3.4
+commands =
+    nosetests --with-xunit --with-xcoverage --cover-package=minecraft --nocapture --cover-erase --cover-tests --cover-branches --cover-min-percentage=60
+deps =
+    {[testenv]deps}
+    coverage
+    nosexcover
+
+[testenv:flake8]
+basepython = python3.4
+commands =
+    flake8 minecraft tests setup.py
+deps =
+    {[testenv]deps}
+    flake8
+
+[testenv:pylint]
+basepython = python3.4
+commands =
+    pylint minecraft
+deps =
+    {[testenv]deps}
+    pylint
+
+[testenv:docs]
+basepython = python3.4
+deps =
+    {[testenv:cover]deps}
+    sphinx
+    sphinx-rtd-theme
+commands =
+    {toxinidir}/bin/build_docs