Remove second order dependencies

When installing dependencies in Python 3.4 wsgiref==0.1.2 was failing
with a syntax error. According to the PyPi page `This is a standalone
release of the wsgiref library, that provides validation support for
WSGI 1.0.1 (PEP 3333) for Python versions < 3.2.`.
Fix run_tests.sh path in .travis.yml

It was wrong, now it's right.