Add py34 to tox's envlist
Fix UnicodeDecodeError

Open binary file in binary mode. This happens in py34 because they
fixed the missing ``get_filename`` attribute of ExtensionLoader
Add TOXENV=py34 to .travis.yml
Install python 3.4 from ppa
Travis: add apt-get update
install python 3.4 only if toxenv is py34
Merge pull request #387 from ColinDuquesnoy/py34

UnicodeError with Python 3.4