Add support for tox

Run 'tox' to test against python 2.6, 2.7, and 3.3

README.md

@@ -69,7 +69,7 @@ Make sure to verify (using `pwhois` or otherwise) that the WHOIS data for the do
 
 	./test.py update thedomain.com
 	
-### Running the full test suite
+### Running all tests
 
 	./test.py run all
 	
@@ -77,6 +77,10 @@ Make sure to verify (using `pwhois` or otherwise) that the WHOIS data for the do
 
 	./test.py run thedomain.com
 
+### Running the full test suite including support for multiple python versions
+
+    tox
+
 ### Generating documentation
 
 You need [ZippyDoc](http://cryto.net/zippydoc) (which can be installed through `pip install zippydoc`).

tox.ini

@@ -0,0 +1,7 @@
+[tox]
+envlist = py26,py27,py33
+
+[testenv]
+usedevelop = True
+setenv = VIRTUAL_ENV={envdir}
+commands = python test.py run all