Merge pull request #359 from geoffharcourt/gh/fix-python3-reqs

Don't attempt to install wsgiref under Python 3.x

Author: CamDavidsonPilon

requirements.txt

@@ -5,6 +5,6 @@ pymc==2.3.4
 pyzmq>=13.1.0
 scipy>=0.12.0
 tornado>=3.0.2
-wsgiref>=0.1.2
+wsgiref>=0.1.2; python_version < '3.0'
 praw>=2.0.0
 jinja2